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Why Are Craters Always Round?

Video vocabulary

the

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US / ðə /

UK / ðə /

A1
  • article
  • Used to refer to something already mentioned
  • Used to show there is only one of something
  • determiner
  • Used to describe all of a family

be

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US / bɪ /

UK / bi /

A1
  • verb
  • Being

and

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US / ənd /

UK / ənd, ən,ænd /

A1
  • conjunction
  • Used to refer to two or more things
  • Plus; in addition; on top of that
  • Used to introduce an action that follows another

that

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US / ðæt /

UK / ðæt, ðət /

A1
  • adjecitve
  • The person or thing being talked about
  • Used to identify something both the speakers know
  • adverb
  • Used to reinforce adjectives and adverbs
  • To such a degree
  • conjunction
  • Used to connect a noun clause
  • Used to introduce an adverbial clause
  • Used to introduce a noun clause
  • determiner
  • Used as a noun to refer to something
  • pronoun
  • Referring an object far away
  • Used to refer to the relative pronoun ‘which’

have

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US / həv /

UK / hæv /

A1
  • verb
  • To drink, smoke, eat or use something
  • To experience the effects of something
  • To organize an event, or join in an activity
  • To own, possess, or hold something
  • To cause to happen or produce a particular effect

not

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US / nɒt /

UK / nɑt /

A1
  • adverb
  • Word indicating the negative
  • (Used to form the negative of verbs)

for

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US / fə(r) /

UK / fɔr,fə /

A1
  • preposition
  • Used to show the purpose, or need of something

you

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US / jʊ /

UK / ju /

A1
  • pronoun
  • Person someone is speaking or writing to
  • Person or people in general

this

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US / ðɪs /

UK / ðɪs /

A1
  • adjecitve
  • Used to indicate something already been discussed
  • Used to indicate something happening around now
  • adverb
  • An indication by a physical motion or gesture
  • A specific amount of
  • determiner
  • Person, thing, or idea near you
  • pronoun
  • Person, thing that has already been discussed

with

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US / wɪð /

UK / wɪð, wɪθ /

A1
  • preposition
  • As an employee of a certain company
  • Against something or someone
  • By using something as a means
  • Due to; because of
  • Including
  • Possessing as a feature
  • Related to
  • (Of the manner/attitude by which you do something)
  • Used to express that people or things are together

about

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US / ə'baʊt /

UK / əˈbaʊt /

A1
  • adverb
  • To be ready to; going to
  • Nearly; approximately; roughly
  • Near; next to; close to
  • In every direction; in the area of
  • preposition
  • Concerning or of (a topic)

get

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US / ɡet /

UK / ɡɛt /

A1
  • verb
  • To become affected by illness or disease
  • To begin to feel or understand an emotion or idea
  • To send or bring someone or something home, etc.
  • To go somewhere to obtain something
  • To (cause to) do a particular thing
  • To obtain, receive or be given something
  • To currently have
  • To prepare for use
  • To understand something being said or read

but

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US / bət /

UK / bʌt,bət /

A1
  • conjunction
  • Used before you say something different, opposite

can

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US / kæn /

UK / kən,kæn /

A1
  • noun
  • A metal container for storing food
  • other
  • Able to; have the skill to; have the time to
  • verb
  • To have permission to
  • To be possible to do
  • To preserve food by sealing it in a metal container

they

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US / ðeɪ /

UK / ðe /

A1
  • pronoun
  • Two or more people, animals, or things

just

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US / dʒʌst /

UK / dʒʌst /

A1
  • adjecitve
  • Proper or appropriate; as is deserved
  • Doing or being what is right or fair
  • Legally correct; having enough evidence
  • adverb
  • Almost; nearly
  • Exactly at the time of
  • Exactly (the same as, like)

what

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US / wɒt /

UK / hwɑt, hwʌt, wɔt, wʌt,hwət, wət /

A1
  • adjecitve
  • Used to refer to a particular amount, or number
  • Used to place emphasis on a particular quality
  • adverb
  • To a certain degree
  • determiner
  • Question words used for asking for information
  • exclamation
  • Used to express excitement, shock, or surprise
  • Used to ask people to repeat something they said
  • pronoun
  • Thing or things that; the same kind as
  • Used to emphasize something you are about to say

all

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US / ɔ:l /

UK / ɔl /

A1
  • adverb
  • Completely; totally
  • determiner
  • Being every one of something
  • pronoun
  • 100% of something; the complete amount

like

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US / laɪk /

UK / laɪk /

A1
  • adjecitve
  • Being equal in status or kind to something else
  • Similar; the same
  • adverb
  • For example
  • preposition
  • Used as a filler; used to ad emphasis
  • In a way similar to the way something is done
  • Such as; for example
  • verb
  • To want to
  • To find something pleasing; to prefer something

will

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US / wɪl /

UK / wɪl /

A1
  • noun
  • Desire or choice of someone
  • Document saying who gets your money when you die
  • Strong desire to do something; determination
  • Desire to do something; strong wish to do
  • other
  • Used with verbs to express the future
  • verb
  • To leave property to someone after your death
  • To use mental effort to make something happen
  • Am (is, are) likely to do
  • To influence someone to do something
  • To make something happen by strongly wanting it

go

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US / ɡəʊ /

UK / ɡo /

A1
  • noun
  • A turn in a game
  • verb
  • To attend or be at a place
  • To do an activity
  • To function properly
  • To move or travel to another place

one

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US / wʌn /

UK / wʌn /

A1
  • adjecitve
  • Used to refer to people generally
  • Being a strong example of (something mentioned)
  • number
  • Number 1
  • pronoun
  • You; we; people in general; someone
  • The thing or person previously referred to

there

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US / ðɛə /

UK / ðɛr /

A1
  • adverb
  • Used to illustrate the existence of something
  • In a particular respect
  • In that place or position, at that location

out

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US / aʊt /

UK / aʊt /

A1
  • adverb
  • No longer stylish (e.g. fashion)
  • Away from home, business, or the usual place
  • In a direction/movement away from inside or center
  • noun
  • Act when a batter cannot continue playing
  • verb
  • To tell people a secret

from

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US / frəm /

UK / frʌm, frɑm,frəm /

A1
  • preposition
  • Starting at a particular place, time or level

see

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US / si: /

UK / si /

A1
  • verb
  • To go on a date with someone
  • To predict whether something is, or will be true
  • To understand what someone says
  • To use your eyes to look at something
  • To visit a place often for sightseeing or pleasure
  • To visit or meet with someone
  • To find out by waiting or looking
  • To watch (a game, movie or TV show)

make

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US / meɪk /

UK / mek /

A1
  • noun
  • Product made by a particular company; brand
  • verb
  • To arrange or prepare something e.g. dinner
  • To get to (a place) on time
  • To gain the status of (teacher, lawyer, etc.)
  • To create something by putting things together
  • To earn a certain amount of money at a job
  • To cause or force a person to do something
  • To cause something to happen or be formed

know

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US / nəʊ /

UK / noʊ /

A1
  • verb
  • To be familiar with a person or place, thing
  • To feel sure or be convinced about something
  • To discover or be aware of something
  • To be able to distinguish
  • To have knowledge of things

think

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US / θɪŋk /

UK / θɪŋk /

A1
  • verb
  • To have an idea about something without certainty
  • To have an idea, opinion or belief about something

your

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US / jɔ: /

UK / jʊr, jɔr, jor,jə /

A1
  • determiner
  • Belonging to you; belonging to the other person

time

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US / taɪm /

UK / taɪm /

A1
  • noun
  • Speed at which music is played; tempo
  • Point as shown on a clock, e.g. 3 p.m
  • Number of hours, minutes needed to do something
  • Occasion when something happens
  • Period or occasion that something occurred
  • Period in history or the past
  • Something measured in minutes, hours, days, etc.
  • How long an event takes; duration
  • verb
  • To check speed at which music is performed
  • To choose a specific moment to do something
  • To measure how long an event takes, e.g. a race
  • To schedule something to occur at a specific moment

come

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US / kʌm /

UK / kʌm /

A1
  • verb
  • To arrive at a place
  • (Of mail) to be delivered
  • To move toward someone; go with someone
  • To reach a certain point or state

want

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US / wɔnt /

UK / wɑnt, wɔnt /

A1
  • noun
  • Something you desire or wish for
  • State or condition of poverty
  • verb
  • To desire or wish for something; hope for a thing

more

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US / mɔ:(r) /

UK / mɔr, mor /

A1
  • adjecitve
  • In addition; extra
  • Greater in amount, number, or size
  • adverb
  • To a greater degree; in greater quantity
  • For a longer period of time
  • determiner
  • Additional quantity
  • pronoun
  • A greater or additional number

when

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US / wen /

UK / wɛn /

A1
  • adjecitve
  • Concerning or during the time something happens
  • adverb
  • Word you use to ask about the time, or day
  • conjunction
  • Although
  • In the event that; if
  • pronoun
  • Which time

would

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US / wʊd /

UK / wʊd /

A1
  • other
  • Used to indicate something imagined
  • Used to ask or request something politely
  • Verb used to indicate possibility, request etc.
  • Used to indicate a preference
  • Used to indicate a reaction
  • Indicates something that occurred repeatedly
  • Used to indicate willingness or ability to do

now

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US / naʊ /

UK / naʊ /

A1
  • adverb
  • At the present time or moment
  • Right away or in the next possible moment
  • Used to refer to something that just happened
  • Time between the present and a moment in the past
  • conjunction
  • Resulting from or because of something

some

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US / səm /

UK / sʌm /

A1
  • adjecitve
  • Remarkable; very good (or very bad) in a way
  • Concerning a certain unclear degree, quantity
  • determiner
  • Used to refer to an unspecified amount or number
  • pronoun
  • Number of persons, things in a group, but not all

because

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US / bɪ'kɒz /

UK / bɪˈkɔz, -ˈkʌz /

A1
  • conjunction
  • For a reason

look

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US / lʊk /

UK / lʊk /

A1
  • noun
  • Person's beauty or physical attractiveness
  • Particular style of dress, clothes, or appearance
  • The way someone, something appears to be
  • Act of searching for or examining something
  • verb
  • To appear to be; seem

how

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US / haʊ /

UK / haʊ /

A1
  • adjecitve
  • To what degree? in what amount?
  • adverb
  • (Used to explain the way to do something)
  • exclamation
  • For what purpose or reason?
  • (Used to ask someone or something's condition)

thing

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US / θɪŋ /

UK / θɪŋ /

A1
  • noun
  • (Used to introduce the reason for something)
  • Something you cannot remember the name of

then

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US / ðen /

UK / ðɛn /

A1
  • adverb
  • A time that is not now
  • Following another thing in time or arrangement
  • Following on reasonably from what was just stated
  • At that time, not now

way

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US / weɪ /

UK / we /

A1
  • adverb
  • Used to emphasize the amount of something
  • noun
  • Particular aspect of something being thought about
  • One of various choices that could be made
  • Particular existing condition or state
  • (Often long) distance or length of time
  • How something is done
  • Route to go to a place
  • Small street
  • Usual behavior, emotions or habits of someone

back

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US / bæk /

UK / bæk /

A1
  • adjecitve
  • Farthest from the front e.g. in a classroom
  • adverb
  • Have returned to a place you were before
  • noun
  • The part of a chair that the upper body leans upon
  • Location at the rear of something
  • The reverse of side something
  • Area on the rear of your body
  • verb
  • To bet money on something
  • To go backwards in a car
  • To support and encourage someone or some cause

these

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US / ði:z /

UK / ðiz /

A1
  • determiner
  • People, things, or ideas near you
  • pronoun
  • The objects near the speaker

into

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US / 'ɪntə /

UK / ˈɪntu /

A1
  • preposition
  • Moving or going inside something
  • In the same direction as; in the direction of
  • So as to become; taking the state of

well

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US / wel /

UK / wɛl /

A1
  • adjecitve
  • Being in a fortunate, good condition or state
  • Healthy and in good condition
  • adverb
  • In an acceptable, proper, or successful manner
  • In a complete, total, or full manner
  • A great and considerable degree
  • In a successful way, in a good or satisfactory way
  • exclamation
  • Used to begin or continue a particular statement
  • Used to show you want to start saying something
  • Used to express that you are waiting for a reply
  • You say this to change the topic of a conversation
  • Used to indicate you are making a final remark
  • noun
  • Long deep hole in the ground to get water
  • verb
  • To cause your eyes to fill with tears

very

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US / 'verɪ /

UK / ˈvɛri /

A1
  • adjecitve
  • Concerning a large degree or amount
  • adverb
  • A lot; much; many
  • Used to stress or emphasize a noun

could

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US / kəd /

UK / kʊd /

A1
  • other
  • Past form of 'can' to mean have ability
  • Used to ask for something politely, or to offer

other

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US / 'ʌðə(r) /

UK / ˈʌðər /

A1
  • adjecitve
  • A thing different from that mentioned
  • determiner
  • (Something) else; not the first (one)
  • pronoun
  • Being the one and only thing of that category

over

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US / 'əʊvə(r) /

UK / ˈovɚ /

A1
  • adverb
  • Finished; no longer happening
  • Towards the ground/away from a standing position
  • noun
  • A set of six consecutive balls bowled in cricket
  • other
  • Finished
  • preposition
  • Showing the relation when a thing is above another
  • On or covering something
  • Above or across something
  • More than you need
  • From one side to the other
  • In the direction of; toward

much

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US / mʌtʃ /

UK / mʌtʃ /

A1
  • adjecitve
  • Very; to a high level or degree
  • adverb
  • A lot; large amount; a high degree of
  • Nearly; basically
  • On many occasions; often
  • noun
  • A large amount; a great quantity

actually

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US / ˈæktʃuəli /

UK / ˈæktʃuəli /

A1
  • adverb
  • Used to add new (often different) information

give

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US / ɡɪv /

UK / ɡɪv /

A1
  • noun
  • Degree of flexibility in something, a material
  • verb
  • To hand over or present something to someone
  • To cause someone to have or experience something

where

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US / hwɛə /

UK / hwɛr, wɛr /

A1
  • conjunction
  • At or in the place which
  • In whatever place
  • pronoun
  • Word you use to ask the location of something

down

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US / daʊn /

UK / daʊn /

A1
  • adjecitve
  • Being sad, sick, or unhappy
  • Not operating, working, or functioning as expected
  • adverb
  • In a sitting or lying position
  • Towards or on the ground, floor, or bottom
  • Written or copied onto a piece of paper or book
  • noun
  • A period of play in American Football
  • The soft, smooth hairs that cover a bird's body
  • preposition
  • Along something's path, course, or direction
  • Going from a higher position to a lower position
  • verb
  • To eat or drink very quickly and without stopping

which

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US / wɪtʃ /

UK / hwɪtʃ,wɪtʃ /

A1
  • determiner
  • Question word to ask about a person's choice
  • pronoun
  • (Used to describe something previously mentioned)
  • Question word to decide either, or

our

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US / 'aʊə(r) /

UK / aʊr /

A1
  • determiner
  • Belonging to us

lot

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US / lɒt /

UK / lɑt /

A1
  • noun
  • What happens to a person in life from chance; fate
  • A group of people seen together
  • Item for sale at an auction
  • Small area of land used for a purpose e.g. parking

use

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US / ju:s /

UK / ju:s /

A1
  • noun
  • Ability to employ something
  • Need to enable it to work
  • Permission to do something with something
  • Act of spending money
  • Operation of a machine for its function
  • verb
  • To have; to eat, drink, consume etc.
  • To need to operate or work
  • To operate a machine, e.g. a computer
  • To treat a person badly
  • To do something with, for a task or purpose

their

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US / ðɛː /

UK / ðer /

A1
  • determiner
  • Belonging to them

something

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US / ˈsʌmθɪŋ /

UK / ˈsʌmθɪŋ /

A1
  • adverb
  • In some degree or measure
  • noun
  • a person or thing of some value or consequence
  • pronoun
  • Thing that is not yet known or named
  • Approximately

than

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US / ðən /

UK / ðən /

A1
  • conjunction
  • Used to compare two things that are not equal

only

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US / ˈəunli /

UK / ˈonli /

A1
  • adverb
  • Just one; just that amount or thing; not more than
  • Not very important or serious
  • Just that type of thing, person
  • Short time ago; not before a certain time
  • conjunction
  • Except; but

start

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US / stɑ:t /

UK / stɑrt /

A1
  • noun
  • First time or place that a thing exists; beginning
  • First opportunity to achieve something, e.g. a job
  • Sudden action or movement because you are scared
  • other
  • Beginning of something in place or time
  • verb
  • To do, be or happen for the first time; begin
  • To turn something on

off

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US / ɒf /

UK / ɔ:f /

A1
  • adjecitve
  • (Of event) canceled; no longer occurring
  • Not having on; not wearing
  • Being somewhat wrong
  • adverb
  • Separated, removed, or away from a place or route
  • (Of a machine) no longer turned on or operating
  • (Of light, computer) no longer attached/connected
  • Far away in terms of time or space
  • preposition
  • Away or free from work
  • (Of foods, drink) old and bad to eat, drink
  • Extending or leading from something
  • No longer in or on some transport or vehicle

any

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US / 'enɪ /

UK / ˈɛni /

A1
  • adjecitve
  • One, or some, no matter which
  • pronoun
  • One (thing) of many; some

still

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US / stɪl /

UK / stɪl /

A1
  • adjecitve
  • Quiet; without sound
  • adverb
  • (Used of an action or condition that is ongoing)
  • noun
  • Machine or device for making alcohol
  • Photograph (not a video or moving image)

kind

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US / kaɪnd /

UK / kaɪnd /

A1
  • adjecitve
  • In a caring and helpful manner
  • friendly and considerate
  • noun
  • One type of thing

find

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US / faɪnd /

UK / faɪnd /

A1
  • noun
  • Object discovered by chance
  • Things that have been discovered from searching
  • verb
  • To become aware of something that is happening
  • To discover or meet by chance
  • To decide if someone is guilty of a crime, or not
  • To learn through study, research, or effort
  • To discover something by looking for it

big

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US / bɪɡ /

UK / bɪɡ /

A1
  • adjecitve
  • Popular
  • Serious
  • Large

most

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US / məʊst /

UK / most /

A1
  • adverb
  • Very; extremely
  • Greatest possible degree
  • determiner
  • Constituting nearly all of something
  • pronoun
  • Nearly all of something

around

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US / ə'raʊnd /

UK / əˈraʊnd /

A1
  • adjecitve
  • Close to someone or something
  • adverb
  • Located on every side, or along something
  • With a motion that moves in a circle or a curve
  • Going here and there within (a place)
  • Turned or turning in the opposite direction
  • preposition
  • Roughly; approximately

call

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US / kɔ:l /

UK / kɔl /

A1
  • noun
  • A order or request for action
  • The sound an animal makes, often when in danger
  • A correct prediction, e.g. a decision in a game
  • A short visit to a place or person
  • A decision by a referee or umpire in a game
  • verb
  • To make a request or order for action
  • (Animal) to make sounds to warn of danger
  • To announce the date of an election
  • To make a judgment about something
  • To give someone or something a name
  • To guess in advance the result or outcome
  • To visit a place or person for a short time
  • To phone someone
  • To speak, announce or shout in a loud voice

year

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US / jə: /

UK / jɪr /

A1
  • noun
  • Unit of time equal to 12 months or 365 or 366 days
  • Used to refer to the age of a person

why

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US / waɪ /

UK / hwaɪ, waɪ /

A1
  • adverb
  • Question word to ask for a reason
  • exclamation
  • (Used to express surprise or approval)

should

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US / ʃʊd /

UK / ʃʊd /

A1
  • other
  • Used to indicate what is proper or reasonable

talk

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US / tɔ:k /

UK / tɔk /

A1
  • noun
  • Style of speaking
  • Discussion between two countries
  • Giving information in front of people; lecture
  • Saying things or ideas to someone with words
  • verb
  • To make a formal speech about something
  • To say things or ideas to someone with words

through

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US / θru: /

UK / θru /

A2
  • adjecitve
  • having finished using or doing something
  • adverb
  • From the beginning of something until the end
  • preposition
  • Over, in, across an entire thing or place
  • Allowing you to pass between, or to
  • By a particular way or process; by the use of

many

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US / 'menɪ /

UK / ˈmɛni /

A1
  • determiner
  • Used to refer a large number of things

keep

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US / ki:p /

UK / kip /

A1
  • noun
  • Large, strong tower in the middle of a castle
  • Money spent on you so you can live in a place
  • verb
  • To continue doing something; not to stop
  • To stop balls going in a goal in sports
  • To not give back or return something
  • (Of food) to not spoil or not rot
  • To take possession of something to own, e.g. a pet
  • To have and continue to hold something
  • To do something that you have promised or agreed
  • To stay in a certain place or condition
  • To maintain the rules

video

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US / 'vɪdɪəʊ /

UK / ˈvɪdiˌo /

A2
  • adjecitve
  • Of a moving film, with sound
  • noun
  • Recording capturing action with sound
  • verb
  • To make a moving film of, with sound

watch

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US / wɒtʃ /

UK / wɑtʃ /

A1
  • noun
  • Period of time someone is responsible for guarding
  • Device you wear on your wrist that shows the time
  • Official warning statement, e.g. of bad weather
  • verb
  • To keep in check, manage, or control something
  • To look at something for entertainment, e.g. TV
  • To guard a place or people; protect child, etc.
  • To look at carefully to work out what is happening
  • To protect and care for someone or something

leave

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US / li:v /

UK / liv /

A1
  • noun
  • Permission to do something
  • Vacation time; time off work
  • verb
  • To go away from; depart
  • To gift property to someone after you die
  • To allow something to continue happening
  • To let something remain unused or available
  • To let something or someone remain somewhere

never

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US / 'nevə(r) /

UK / ˈnɛvɚ /

A1
  • adverb
  • Not ever; not at any time

end

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US / end /

UK / ɛnd /

A1
  • noun
  • The point where a process or activity stops
  • A point that marks the limit of something; finish
  • Goal or desired result
  • The tip, edge or limit of something
  • verb
  • To be the last part of something

same

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US / seɪm /

UK / sem /

A1
  • adjecitve
  • Being equal in quality and amount
  • Identical; not different
  • Not changing; constant

might

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US / maɪt /

UK / maɪt /

A1
  • other
  • Used to politely request an action
  • Used to express that something could happen
  • Power, strength, force or influence

pretty

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US / 'prɪtɪ /

UK / ˈprɪti /

A1
  • adjecitve
  • Being attractive to the eye in a simple way
  • adverb
  • Very; to a great degree

help

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US / help /

UK / hɛlp /

A1
  • noun
  • Something given to enable a person to do something
  • Assistance given to someone in need
  • Someone who makes something easier or possible
  • verb
  • To act to enable a person to do something; assist
  • To make something better or less difficult

different

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US / ˈdɪfrənt /

UK / ˈdɪfrənt /

A1
  • adjecitve
  • Not of the same kind; unlike other things

ever

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US / 'evə(r) /

UK / ˈɛvɚ /

A1
  • adverb
  • At any time; at all times in the future

part

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US / pɑ:t /

UK / pɑ:rt /

A1
  • adjecitve
  • To some degree; half; not fully
  • noun
  • Division of a book
  • Ratio of something, e.g. 3 of gin, 1 of tonic
  • A line in a person's hair, made with a comb
  • Character an actor plays on stage, movie, or TV
  • Some, but not all of a specific thing
  • Role in causing something to happen
  • verb
  • To make a line in a person's hair, by using a comb
  • To move two things apart creating a space
  • To leave someone, or to break off a relationship

point

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US / pɔɪnt /

UK / pɔɪnt /

A1
  • noun
  • An item to be discussed
  • Small spot or dot
  • Fact or detail
  • Feature of something
  • The size of the text on a page or screen
  • A certain time or stage in a process
  • Certain position in time or space
  • Idea or fact you try to convince people about
  • Measurement of scores in a game, sport
  • Sharp end of something, e.g. a pen or pin
  • verb
  • To face a certain direction, e.g. north
  • To indicate something with your finger to others

turn

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US / tɜ:n /

UK / tɚn /

A1
  • noun
  • Place where changing of direction happens
  • Your time or chance to perform a duty
  • Your chance to play or do in say a game
  • Unexpected change, as in the weather
  • verb
  • To become (a particular age)
  • To become a different quality, color, etc.
  • To change the direction of something, e.g. a car
  • To move in an opposite direction or position
  • To shape metal with a spinning tool

place

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US / pleɪs /

UK / ples /

A1
  • noun
  • Particular location, area or region
  • verb
  • To put someone in a particular type of situation
  • To put something in a certain location or position

run

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US / rʌn /

UK / rʌn /

A1
  • noun
  • Journey between two places made by ship or car
  • Series of similar things or successes and failures
  • Act of running; exercise of running
  • verb
  • To depart or travel according to a schedule
  • To cause an animal to move in a certain direction
  • (Of an engine) to be operating
  • To start or use a computer program
  • To flow in a certain direction, like a liquid
  • To manage or operate a business
  • To operate or drive something
  • (Of a road) to go from one place to another
  • To move your legs faster than walking

thank

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US / θæŋk /

UK / θæŋk /

A1
  • verb
  • To tell someone you are grateful to them

own

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US / əʊn /

UK / on /

A1
  • adjecitve
  • Belong to oneself
  • determiner
  • Yours, his, hers, etc.; not belonging to another
  • pronoun
  • (Something) belong to myself
  • verb
  • To have something as your property

second

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US / 'sekənd /

UK / ˈsɛkənd /

A1
  • adjecitve
  • 2nd; the one following first
  • noun
  • Unit of time; one sixtieth of a minute
  • Short period of time that you wait for someone
  • (Do) soon
  • verb
  • To agree to support a proposal at a meeting

few

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US / fju: /

UK / fju /

A1
  • pronoun
  • Not many, a small number

change

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US / tʃeɪndʒ /

UK / tʃendʒ /

A1
  • noun
  • Exchange of one set of clothes for another
  • Money in the form of coins instead of paper
  • Money returned after giving too much
  • Act of making or becoming something else
  • verb
  • To exchange one set of clothes for another
  • To exchange one kind of money for another
  • To replace something with another thing
  • To make or become something else
  • To go from one train, bus, etc. and go to another

hope

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US / həʊp /

UK / hop /

A1
  • noun
  • When you wish something will happen; what you wish
  • verb
  • To expect and want something to happen

number

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US / ˈnʌmbə(r) /

UK / ˈnʌmbɚ /

A1
  • noun
  • Symbols such as 1, 2, 56, 793
  • Particular song or dance performed during a show
  • Total quantity or amount of things
  • verb
  • To put numbers on things
  • To assign a sequence within a group, series, set
  • To claim to be part of a larger group, series, set

both

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US / bəuθ /

UK / boθ /

A1
  • determiner
  • Used to refer to two things at the same time
  • pronoun
  • Used to refer to two things at the same time

stuff

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US / stʌf /

UK / stʌf /

A1
  • noun
  • Generic description for things, materials, objects
  • verb
  • To push material inside something, with force

hit

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US / hɪt /

UK / hɪt /

A1
  • noun
  • A planned killing, usually for money
  • Song, movie etc. that is successful
  • When someone strikes someone or something
  • Time when a player makes contact with the ball
  • Time when a website is accessed
  • verb
  • To have a negative impact on a person/place/thing
  • To press something, such as a button or switch
  • To suddenly realize the importance of something
  • To move your hand, a bat, etc. against with force
  • To fight, attack or damage something or someone
  • To arrive at a specific place, level, or goal
  • To make contact with the ball in a game or sport

its

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US / ɪts /

UK / ɪts /

A1
  • adjecitve
  • Referring to or belonging to ‘it’
  • determiner
  • Of something; belonging or related to something
  • other
  • Possessive form of “it”

head

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US / hed /

UK / hɛd /

A1
  • noun
  • Counter for the number of cattle
  • Natural mental ability or intelligence
  • Leader or person with the greatest authority
  • Mind; mental ability; mental state
  • Side of a coin with a head on it
  • Top part of your body with eyes and a mouth
  • Starting point of something, e.g. a river
  • verb
  • To hit a ball with your head in a game
  • To be first or at the front or top (e.g. a list)
  • To travel or move toward a particular place; To go in a particular direction
  • To become the leader of something
  • To lead or be responsible for something

since

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US / sɪns /

UK / sɪns /

A1
  • adverb
  • At a point before the present time
  • conjunction
  • For this reason; because
  • preposition
  • From the time in the past that

wait

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US / weɪt /

UK / wet /

A1
  • verb
  • To delay or not do something until later
  • To spend time until an expected thing happens
  • To remain in a place until a thing happens

between

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US / bɪˈtwi:n /

UK / bɪˈtwin /

A1
  • preposition
  • From one person, thing, or place, to another
  • In the space that separates two objects
  • Among two or more people who share something

easy

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US / ˈi:zi /

UK / ˈizi /

A1
  • adjecitve
  • Not hard to do; not difficult

quite

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US / kwaɪt /

UK / kwaɪt /

A1
  • adverb
  • Not very; fairly
  • Very; In a complete or total manner

stay

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US / steɪ /

UK / ste /

A1
  • noun
  • Legal order to stop or delay an action
  • Strong rope or wire that supports a ship's mast
  • Period of time spent living in or visiting a place
  • verb
  • To keep trying without giving up
  • To remain in the same place and not move away
  • To spend time visiting a place or someone's home

couple

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US / 'kʌpl /

UK / ˈkʌpəl /

A2
  • noun
  • Two people in a romantic relationship
  • Two of something; two people; a pair
  • verb
  • To join something to something else
  • (Two animals) to engage in sexual relations
  • To put two people or things together

learn

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US / lɜ:n /

UK / lɚn /

A1
  • verb
  • To get knowledge or skills by study or experience

important

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US / ɪmˈpɔ:tnt /

UK / ɪmˈpɔrtnt /

A1
  • adjecitve
  • Having power or authority
  • Having a big effect on (person, the future)

sort

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US / sɔ:t /

UK / sɔrt /

A1
  • noun
  • Group or class of similar things or people
  • verb
  • To organize things by putting them into groups
  • To deal with things in an organized way

full

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US / fʊl /

UK / fʊl /

A1
  • adjecitve
  • Containing all the parts; complete
  • Containing or holding as much as possible
  • Having had enough food
  • adverb
  • In a direct manner; completely

exactly

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US / ɪgˈzæktli /

UK / ɪɡˈzæktli /

A1
  • adverb
  • No more and no less than; precisely

create

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US / krɪ'eɪt /

UK / kriˈet /

A1
  • verb
  • To make, cause, or bring into existence

understand

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US / ˌʌndə'stænd /

UK / ˌʌndɚˈstænd /

A1
  • verb
  • To know the meaning of language, what someone says

fall

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US / fɔ:l /

UK / fɔl /

A1
  • noun
  • Season after summer and before winter; Autumn
  • A drop in amount; decrease
  • Dropping from a standing position to the ground
  • verb
  • To drop in amount; to decrease
  • To come down from a higher position suddenly
  • To go from standing to the ground, by accident

course

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US / kɔː(r)s /

UK / kɔː(r)s /

A2
  • noun
  • The route or direction e.g. a river moves along
  • A series of lessons given over time
  • Part of a meal that is served separately
  • Place where horses etc. race against each other
  • Route or direction that a river, etc. moves along
  • verb
  • To flow somewhere rapidly and in great quantity

team

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US / ti:m /

UK / tim /

A1
  • noun
  • Group of people working on a task together
  • Group of people playing a sport together

word

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US / wɜ:d /

UK / wɚd /

A1
  • noun
  • Unit of language that has a meaning
  • Promise
  • Short remark or piece of information
  • verb
  • To express something by choosing particular words

either

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US / ˈaɪðə(r) /

UK / ˈiðɚ, ˈaɪðɚ /

A1
  • adjecitve
  • One of two (used when there is a choice of two)
  • adverb
  • (After negative statements) likewise, in addition
  • conjunction
  • Used as the first of two connected things
  • determiner
  • Used as the first of two connected things
  • pronoun
  • The one or the other

below

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US / bɪ'ləʊ /

UK / bɪˈlo /

A1
  • preposition
  • In a lower position, place, or level

free

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US / fri: /

UK / fri /

A1
  • adjecitve
  • Living, happening without being controlled
  • Costing no money
  • Not working; not busy
  • verb
  • To release (e.g. bird) from a cage or prison

single

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US / 'sɪŋɡl /

UK / ˈsɪŋɡəl /

A1
  • adjecitve
  • Being one only, without others
  • Only; merely
  • Not married or in a relationship
  • noun
  • One run in cricket or a hit baseball
  • An individual song from a CD or album
  • Person who is not married or in a relationship

fast

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US / fɑ:st /

UK / fæst /

A1
  • adjecitve
  • In a way that is difficult to move or change
  • Moving or able to move quickly
  • Showing time that is later than the actual time
  • adverb
  • With a great deal of speed
  • noun
  • Period of time when a person chooses not to eat
  • verb
  • To refuse food for a long time

throw

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US / θrəʊ /

UK / θroʊ /

A1
  • noun
  • Arm movement to make a thing fly through the air
  • Loose cloth or blanket (usually over a chair)
  • Forcibly putting someone on the ground
  • verb
  • To use your arm to make something fly in the air
  • To move part of your body suddenly and forcefully
  • To confuse or upset someone
  • (E.g. judo) to forcibly put someone on the ground
  • To put something somewhere suddenly and roughly

literally

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US / ˈlɪtərəli /

UK / ˈlɪtərəli /

B1
  • adverb
  • So as to express the exact meaning of something
  • Used to say something is true, even if unlikely

basically

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US / ˈbeɪsɪkli /

UK / ˈbesɪkəli,-kli /

A2
  • adverb
  • Used before you explain something simply, clearly

past

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US / pɑ:st /

UK / pæst /

A2
  • adjecitve
  • No longer current or new
  • adverb
  • So as to go beyond, or further than something
  • noun
  • Time that existed before now, e.g. long ago
  • preposition
  • After a particular time
  • At a later point in distance; beyond

support

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US / səˈpɔ:t /

UK / səˈpɔrt, -ˈport /

A1
  • noun
  • Assistance or advice given to someone
  • Evidence that helps prove something is true
  • A thing to hold up or prevent from falling down
  • verb
  • To give assistance or advice to someone
  • To help prove or show that something is true
  • To hold up or prevent from falling down

along

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US / əˈlɒŋ /

UK / əˈlɔ:ŋ /

A1
  • adverb
  • As a companion; taken with someone
  • preposition
  • At a point on a line

link

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US / lɪŋk /

UK / lɪŋk /

A2
  • noun
  • Any one of the rings that are part of a chain
  • Connection between two or more things or people
  • Webpage item you click to go to another webpage
  • verb
  • To join or connect together

spend

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US / spend /

UK / spɛnd /

A2
  • verb
  • To use money to pay for something
  • To use time in order to do something
  • To use up something completely

body

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US / ˈbɒd.i /

UK / ˈbɑdi /

A1
  • noun
  • An object distinct from other objects
  • A group of people involved in an activity together
  • Main part of something
  • A person's physical self

large

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US / lɑ:dʒ /

UK / lɑ:rdʒ /

A1
  • adjecitve
  • Big; of great size; broad, tall, wide, or fat

possible

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US / ˈpɒsəbl /

UK / ˈpɑsəbəl /

A1
  • adjecitve
  • Being able or appropriate for a task or purpose
  • Having a chance of happening, or being true

beautiful

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US / 'bju:tɪfl /

UK / ˈbjutəfəl /

A1
  • adjecitve
  • Having dome something well
  • Being very attractive or appealing physically

system

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US / 'sɪstəm /

UK / ˈsɪstəm /

A1
  • adjecitve
  • Working in an organized, logical way
  • noun
  • Set of organized, planned ideas that work together

clear

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US / klɪə(r) /

UK / klɪr /

A1
  • adjecitve
  • Empty; without anything in it or on it
  • Being certain and without doubt
  • Being without any streaks, spots, or cracks
  • Easy to understand; well-explained; obvious
  • adverb
  • Completely; entirely; through the whole of
  • Away from; free from
  • verb
  • To recover from or remove a problem
  • To get rid of the entire contents of
  • To give permission for something to happen
  • To make a place or surface empty by removing
  • To prove that someone is not guilty or to blame

push

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US / pʊʃ /

UK / pʊʃ /

A1
  • noun
  • Movement into enemy country with a military attack
  • Encouragement to convince someone to do something
  • Action of forcing something away from you
  • Act of forcing a change in price, quantity etc.
  • verb
  • To move into enemy country with a military attack
  • To press down (a button or a switch)
  • To attempt to make someone accept certain beliefs
  • To encourage or convince someone do something
  • To force something away from you
  • To force a change in a quantity, price, number

straight

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US / streɪt /

UK / stret /

A2
  • adjecitve
  • Not having curves, bends, or angles
  • Not gay; heterosexual
  • honest and direct
  • adverb
  • in a line; immediately; honestly and directly

form

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US / fɔ:m /

UK / fɔrm /

A1
  • noun
  • Sports team or person's current winning record
  • Document you complete when making an application
  • Visible shape or style; type; kind
  • verb
  • To organize something such as a club or group
  • To develop; to come into a shape or substance
  • To make something into a particular shape

space

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US / speɪs /

UK / spes /

A1
  • noun
  • Empty area kept for a specific reason, like a car
  • Empty area with nothing in it
  • Area in the sky where the stars are
  • Area between written words on a page
  • verb
  • To make a certain distance or time between

click

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US / klɪk /

UK / klɪk /

A1
  • noun
  • The sound a computer mouse makes when you press it
  • A short, slight, and sharp sound
  • verb
  • To work well with someone or something
  • To press a computer mouse
  • To make a short, slight, and sharp sound

release

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US / rɪ'li:s /

UK / rɪ'li:s /

A2
  • noun
  • Act of freeing someone from a duty or burden
  • Introduction of a new product, film, book, etc.
  • Relief from sadness, suffering or trouble
  • Act of freeing from a jail, cage, prison, etc.
  • verb
  • To free someone from a responsibility or burden
  • To allow a film, music etc. to be sold/distributed
  • To allow to leave a jail, cage, etc.; let out
  • To let go of something you are holding

building

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US / ˈbɪldɪŋ /

UK / ˈbɪldɪŋ /

A1
  • noun
  • A structure with a roof and walls, e.g. a house
  • verb
  • To establish e.g. a reputation, over time
  • To construct a house, office, factory

example

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US / ɪgˈzɑ:mpl /

UK / ɪɡˈzæmpəl /

A1
  • noun
  • Thing, person which represents a category

itself

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US / ɪtˈself /

UK / ɪtˈsɛlf /

A1
  • pronoun
  • Referring to it

spot

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US / spɒt /

UK / spɑt /

A2
  • noun
  • A certain place or area
  • A difficult time; awkward situation
  • Place or ranking on a list
  • A small amount of (substance help hard work etc.)
  • Mark caused by a drop of liquid, food, etc.
  • verb
  • To see someone or something by chance

history

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US / 'hɪstrɪ /

UK / ˈhɪstəri /

A2
  • noun
  • Established pattern or record
  • Study of past events as an academic subject

explain

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US / ɪk'spleɪn /

UK / ɪkˈsplen /

A1
  • verb
  • To make clear or easy to understand by describing

ground

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US / graʊnd /

UK / ɡraʊnd /

A1
  • noun
  • Connection of electrical equipment to earth
  • Place where people play particular sports
  • Solid surface of the earth that we stand on
  • verb
  • To break (coffee, etc.) into tiny bits with machine
  • To make loud jarring noise by pressing hard
  • To make sharp or smooth through friction
  • To press together with force making a sound
  • To punish someone by not allowing them to go out
  • To hit the bottom
  • (Of boat) to hit the bottom so it cannot move
  • To prevent a plane from taking off
  • To place the ball over the goal line in rugby

description

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US / dɪˈskrɪpʃn /

UK / dɪˈskrɪpʃən /

A2
  • noun
  • Explanation of what something is like, looks like

size

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US / saɪz /

UK / saɪz /

A1
  • noun
  • How big or small a thing is
  • Standard measurements for clothing, shoes
  • verb
  • To make something to fit a particular measurement
  • To organize or group from small to large

travel

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US / ˈtrævl /

UK / ˈtrævəl /

A1
  • noun
  • Going to other places, esp. distant places
  • verb
  • To go to a place that is far away

likely

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US / 'laɪklɪ /

UK / ˈlaɪkli /

A1
  • adjecitve
  • With a good chance that a thing will really happen
  • Seeming suitable or good for a particular purpose

speed

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US / spi:d /

UK / spid /

A2
  • noun
  • How fast or slow something is or is done
  • verb
  • To move quickly when completing an action
  • To drive a vehicle faster than laws allow

compare

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US / kəm'peə(r) /

UK / kəmˈpɛr /

A1
  • verb
  • To consider how similar and different things are

rock

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US / rɒk /

UK / rɑk /

A1
  • noun
  • Type of popular music with a strong, loud beat
  • Strong, tough person who can be relied upon
  • Big stone; hard, solid substance forming mountains
  • verb
  • To be greatly upset by something, e.g. a death
  • To be extremely effective or pleasing
  • To play, sing along with, or dance to heavy music
  • To move back and forth or from side to side

depend

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US / dɪˈpend /

UK / dɪˈpend /

B1
  • verb
  • Be controlled or determined by (someone/something)

energy

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US / 'enədʒɪ /

UK / ˈɛnədʒi /

A2
  • noun
  • Physical or mental strength

mark

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US / mɑ:k /

UK / mɑrk /

A2
  • noun
  • Person's name
  • A dirty spot or line on something
  • Grade or score given for homework
  • Line or symbol made when writing
  • Particular point on a scale of measurement
  • Grade, such as a student receives in school
  • Stain or spot on something
  • Sign or symbol of a quality of feeling
  • Written sign or symbol
  • verb
  • To put a dirty spot or line on something
  • To give a grade for homework
  • To indicate something with a sign or symbol
  • To make or leave a visible sign of (path, etc.)
  • (Animals) to go to the toilet to show your area
  • To write or draw a line on something

accord

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US / ə'kɔ:d /

UK / əˈkɔ:rd /

B1
  • noun
  • Agreement or harmony
  • An agreement or treaty between countries
  • verb
  • To be in harmony or agreement; consent
  • To give (someone) the respect due to them

teach

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US / ti:tʃ /

UK / titʃ /

A1
  • verb
  • To help someone learn or do something

impact

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US / 'ɪmpækt /

UK / ˈɪmˌpækt /

A2
  • noun
  • A striking effect or result to hit with force
  • Very strong influence
  • Act or force of one thing hitting something else
  • verb
  • To hit or strike someone or something with force

shape

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US / ʃeɪp /

UK / ʃep /

A1
  • noun
  • The outer form of something, what it looks like
  • Appearance or form of a person or thing
  • Condition or state of someone or something
  • Someone or something that cannot be seen clearly
  • verb
  • To influence something to make it the way you want
  • To give a certain material a particular form

specific

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US / spəˈsɪfɪk /

UK / spɪˈsɪfɪk /

A2
  • adjecitve
  • Precise; particular; just about that thing
  • Concerning one particular thing or kind of thing

everywhere

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US / ˈevriweə(r) /

UK / ˈevriwer /

A1
  • adverb
  • Every place

skill

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US / skɪl /

UK / skɪl /

A2
  • noun
  • Ability to do something well

exact

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US / ɪɡ'zækt /

UK / ɪɡˈzækt /

A2
  • adjecitve
  • Completely correct; accurate; specific
  • verb
  • To get something, sometimes using force

computer

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US / kəmˈpju:tə(r) /

UK / kəmˈpjutɚ /

A1
  • noun
  • Machine for storing data, accessing the internet

direction

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US / də'rekʃn /

UK / dɪˈrɛkʃən, daɪ- /

A2
  • noun
  • When someone tells people what to do
  • Describes the way you are going, e.g. North

degree

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US / dɪˈgri: /

UK / dɪˈɡri /

A2
  • noun
  • Amount or extent of something
  • Unit for measuring temperature or angles
  • Qualification received after completing university

target

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US / 'tɑ:ɡɪt /

UK / ˈtɑrɡɪt /

A2
  • noun
  • A goal or amount you are trying to achieve
  • Group you are trying to sell to or influence
  • Something shot at to practice shooting
  • verb
  • To try to influence; direct a message toward
  • (Army) to aim an attack at something

strike

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US / straɪk /

UK / straɪk /

A2
  • noun
  • A punch or hit
  • Fact of not hitting the ball when playing baseball
  • Refusal to work to get more pay, protest something
  • verb
  • To hit something
  • To suddenly become (e.g. rich)
  • To have an idea occur to you

billion

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US / ˈbɪljən /

UK / ˈbɪljən /

A2
  • noun
  • Number 1,000,000,000

research

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US / rɪ'sɜ:tʃ /

UK / rɪˈsɚtʃ, ˈriˌsɚtʃ /

A2
  • noun
  • Study done to discover new ideas and facts
  • Work done to find or discover knowledge
  • verb
  • To study in order to discover new ideas and facts

material

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US / məˈtɪəriəl /

UK / məˈtɪriəl /

A2
  • adjecitve
  • Relevant; (of evidence) important or significant
  • Belonging to the world of physical things
  • noun
  • Cloth; fabric
  • Supplies or data needed to do a certain thing
  • Substance from which a thing is made of

slash

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US / slæʃ /

UK / slæʃ /

B2
  • noun
  • Line ( / ) used in writing
  • Long, deep cut, caused by a sharp object
  • verb
  • To cut violently with a sharp object
  • To decrease something by a large amount

planet

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US / 'plænɪt /

UK / ˈplænɪt /

A2
  • noun
  • One of the bodies that orbit the sun

busy

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US / 'bɪzɪ /

UK / ˈbɪzi /

A1
  • adjecitve
  • Working hard doing something; full of activity
  • verb
  • To actively be occupied with doing something

surface

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US / 'sɜ:fɪs /

UK / ˈsɚfəs /

A2
  • adjecitve
  • Of the top layer; not deep or meaningful
  • noun
  • Top layer of the ground or of water
  • Nature or emotions that show, but may not be true
  • Outside or upper layer of something
  • verb
  • To give (road) a top layer
  • To appear after being hidden, unseen, or unknown
  • To come to the top of something; emerge
  • To come to the top level of water, mud, etc.

earth

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US / ɜ:θ /

UK / ɚθ /

A1
  • noun
  • Wire connecting an electrical device to the ground
  • The planet we live on
  • Soil in which we grow plants

path

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US / pɑ:θ /

UK / pæθ, pɑθ /

A2
  • noun
  • Method of living leading to a particular result
  • Track made with stones, by walking over the ground

whose

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US / hu:z /

UK / huz /

A1
  • pronoun
  • Refers to the person who owns something

flat

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US / flæt /

UK / flæt /

A2
  • adjecitve
  • Level; even; without curves or bumps
  • Lifeless; lacking energy or vitality
  • adverb
  • In a certain, direct or absolute manner
  • Against a surface without lifting or curving away
  • noun
  • Apartment; set of rooms for living in
  • The smooth or level part of something
  • Musical tone lower than another by a small degree
  • verb
  • To share an apartment with someone

sun

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US / sʌn /

UK / sʌn /

A1
  • noun
  • Light and heat coming from a large star in the sky
  • Hot shining star the Earth moves around
  • verb
  • To lie in the sunshine and enjoy its warmth

angle

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US / ˈæŋgl /

UK / ˈæŋɡəl /

B1
  • noun
  • Place where two lines or surfaces meet

spin

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US / spɪn /

UK / spɪn /

B1
  • noun
  • A dizzy feeling your head is turning around
  • A slant or hidden purpose, as in politicians' talk
  • A movement in a rapid turning motion
  • verb
  • To make a ball rotate when throwing it
  • To feel dizzy/confused, as in my head is spinning
  • To convert material such as cotton into thread
  • To move something in a rapid turning motion

fairly

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US / 'feəlɪ /

UK / ˈfɛrli /

A2
  • adverb
  • Quite; pretty; between very and a little
  • In a manner that is right and acceptable

majority

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US / mə'dʒɒrətɪ /

UK / məˈdʒɔrɪti, -ˈdʒɑr- /

B1
  • noun
  • Amount that is more than half of a group

odd

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US / ɒd /

UK / ɑd /

A2
  • adjecitve
  • Being unmatched with someone or something
  • Being a number not able to be divided by two
  • Being unexpected or different; out of the ordinary

circle

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US / 'sɜ:kl /

UK / ˈsɚkəl /

A1
  • noun
  • A perfectly round shape
  • A group of people who share a common interest
  • verb
  • To go all the way around something
  • To enclose in something round by surrounding it

sky

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US / skaɪ /

UK / skaɪ /

A2
  • noun
  • The place where we see clouds above us

engage

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US / ɪn'ɡeɪdʒ /

UK / ɪn'gedʒ /

A2
  • verb
  • To start to fight with an enemy
  • To hire someone for a task or job
  • To have or hold the focus or interest of someone
  • To carry out, participate in; be involved in

brilliant

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US / 'brɪlɪənt /

UK / ˈbrɪljənt /

A2
  • adjecitve
  • Having a great amount of intelligence or talent
  • Being very bright, like a diamond; shining

beauty

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US / 'bju:tɪ /

UK / ˈbjuti /

A2
  • noun
  • Something attractive that produces great pleasure
  • Physically or visually attractive person

trial

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US / ˈtraɪəl /

UK / ˈtraɪəl, traɪl /

A2
  • adjecitve
  • Being made or done as a test or experiment
  • noun
  • Hearing and judgment of a case in court
  • Act or process of testing or experimenting
  • verb
  • To be made or done as a test or experiment

bomb

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US / bɒm /

UK / bɑm /

B1
  • noun
  • An explosive device
  • verb
  • To attack with explosives
  • To fail or be completely unsuccessful

debate

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US / dɪ'beɪt /

UK / dɪˈbet /

A2
  • noun
  • General public discussion of a topic
  • A formal event where two sides discuss a topic
  • verb
  • To consider options before making a decision
  • To take part in a formal discussion

viewer

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US / ˈvju:ə(r) /

UK / ˈvjuɚ /

A2
  • noun
  • Special machine to look at pictures
  • Someone who watches, e.g. television

somewhat

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US / ˈsʌmwɒt /

UK / ˈsʌmwʌt /

B1
  • adverb
  • Rather; kind of (but not great)

makeup

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US / 'meɪkʌp /

UK / ˈmekˌʌp /

B2
  • noun
  • Substance put on the face to make you look pretty

premium

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US / ˈpri:miəm /

UK / ˈprimiəm /

B1
  • adjecitve
  • Having a higher than normal quality
  • noun
  • Money paid as a fee for insurance

roughly

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US / ˈrʌfli /

UK / ˈrʌflɪ /

B1
  • adverb
  • Approximately; (of numbers) about; around
  • In a manner that is violent or not careful
  • In an inexact, imprecise or violent way
  • In a basic, simple manner

maximum

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US / ˈmæksɪməm /

UK / ˈmæksəməm /

A2
  • noun
  • Largest or highest number or amount of something

moon

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US / mu:n /

UK / mun /

A2
  • noun
  • Round object circling the Earth at night
  • verb
  • To expose your buttocks as a joke

researcher

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US / rɪ'sɜ:tʃə(r) /

UK / rɪˈsətʃɚ /

A2
  • noun
  • Someone who works to find new facts and ideas

closely

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US / 'kləʊslɪ /

UK / ˈkloslɪ /

A2
  • adverb
  • In a careful manner
  • Nearby; just next to

fold

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US / fəʊld /

UK / fold /

B1
  • noun
  • Pen where sheep are kept
  • Group of people who have a common belief
  • verb
  • To bend one part of something against another
  • (Of business) to fail or close down
  • To hold something together such as your two arms

hint

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US / hɪnt /

UK / hɪnt /

A2
  • noun
  • Helpful piece of information
  • Tiny quantity or sign of something
  • verb
  • To suggest without being direct about it

belt

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US / belt /

UK / bɛlt /

A2
  • noun
  • Band of material worn around a person's waist
  • Area with a lot of a particular feature e.g. corn
  • verb
  • To leave somewhere quickly (UK use)
  • To put a belt around something or someone

kilometre

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US / ˈkɪləmi:tə(r) /

UK / ˈkɪləmiːtər /

A1
  • noun
  • A metric unit of length equal to 1000 metres

vary

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US / ˈveəri /

UK / ˈveri /

A2
  • verb
  • To change something and make it different
  • To be changeable, both up and down

annual

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US / ˈænjuəl /

UK / ˈænjuəl /

A2
  • adjecitve
  • Happening once a year, or every year
  • noun
  • Book (in a series) released each year

puzzle

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US / 'pʌzl /

UK / ˈpʌzəl /

A2
  • noun
  • Something challenging to explain or understand
  • Game requiring the player to find an answer
  • Game with many pieces, e.g. forming a picture
  • A problem requiring thought and skill to be solved
  • verb
  • To be a challenge to understand; confuse

principle

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US / ˈprɪnsəpl /

UK / ˈprɪnsəpəl /

A2
  • noun
  • Moral rule or belief governing a person's behavior
  • Natural law that explains how things work

intro

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US / ˈɪntrəʊ /

UK / ˈɪntroʊ /

A1
  • noun
  • Opening part of a text or piece of music

solar

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US / 'səʊlə(r) /

UK / ˈsolɚ /

B1
  • adjecitve
  • Concerning the sun, or its heat

mechanic

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US / məˈkænɪk /

UK / mɪˈkænɪk /

B1
  • noun
  • A person who looks after/works with machinery

conclude

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US / kənˈklu:d /

UK / kənˈklud /

A2
  • verb
  • To finish or cause to finish; end
  • To arrive at a judgment or opinion

subscription

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US / səbˈskrɪpʃn /

UK / səbˈskrɪpʃən /

B1
  • noun
  • Regular payment for a service, magazine etc.

stem

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US / stem /

UK / stɛm /

B1
  • noun
  • Long thin central part of a plant, bearing leaves
  • Long thin part supporting something e.g. a light
  • Main part of a word, e.g. 'use' in 'useful'
  • verb
  • To remove the stem of a flower or fruit
  • To start from or be the origin of
  • To stop something bad from spreading or developing

occasionally

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US / əˈkeɪʒnəli /

UK / əˈkeɪʒən(ə)li /

A2
  • adverb
  • Not very often; sometimes; seldom

smack

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US / smæk /

UK / smæk /

B2
  • verb
  • To slap or hit, e.g. with a resounding noise

tilt

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US / tɪlt /

UK / tɪlt /

B2
  • noun
  • Position in which one side is above the other
  • verb
  • To change to a newly preferred idea or opinion
  • To move something away from the upright
  • To influence (public opinion) in a certain way

mud

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US / mʌd /

UK / mʌd /

A2
  • noun
  • Soft, wet dirt

shallow

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US / 'ʃæləʊ /

UK / ˈʃælo /

B1
  • adjecitve
  • Not deep; short from top to bottom
  • Lacking interest in serious things; superficial

rocky

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US / 'rɒkɪ /

UK / ˈrɑki /

A1
  • adjecitve
  • (Of a marriage, etc.) involving many difficulties
  • With abundant rocks or stones

circular

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US / ˈsɜ:kjələ(r) /

UK / ˈsɜ:rkjələ(r) /

B2
  • adjecitve
  • Shaped like a circle or part of a circle
  • noun
  • Paper with news, ads, etc. sent round to people

stabilize

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US / 'steɪbəlaɪz /

UK / ˈstebəˌlaɪz /

B1
  • verb
  • To make stable/consistent, with no major changes

collision

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US / kəˈlɪʒn /

UK / kəˈlɪʒən /

B2
  • noun
  • Act of crashing into someone or something else

simulation

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US / ˌsɪmjuˈleɪʃn /

UK / ˌsɪmjəˈleʃən /

B1
  • noun
  • A copying method to study the real world

mar

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US / mɑ:(r) /

UK / mɑ:r /

A1
  • noun
  • 3rd month of the year
  • verb
  • To spoil the appearance/atmosphere of something

axis

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US / ˈæksɪs /

UK / ˈæksɪs /

B1
  • noun
  • A line about which a rotating body turns

asteroid

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US / ˈæstərɔɪd /

UK / ˈæstəˌrɔɪd /

B2
  • noun
  • Very small planets that move around the sun

tug

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US / tʌg /

UK / tʌɡ /

B1
  • noun
  • Pull at something that is hard or sudden
  • verb
  • To pull (something) hard or suddenly

astronomer

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US / əˈstrɒnəmə(r) /

UK / əˈstrɑ:nəmə(r) /

B2
  • noun
  • Scientist studying stars and other bodies in space

crater

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US / 'kreɪtə(r) /

UK / ˈkretɚ /

B1
  • noun
  • Large hole in ground caused by heavy impact

wobble

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US / ˈwɒbl /

UK / ˈwɑ:bl /

B2
  • verb
  • To be indecisive; hesitate
  • To walk or move with a rocking, staggering motion

speedy

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US / ˈspi:di /

UK / ˈspidi /

A2
  • adjecitve
  • Moving with or capable of moving with high speed

geometry

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US / dʒiˈɒmətri /

UK / dʒiˈɑ:mətri /

B2
  • noun
  • Mathematical study of shapes, surfaces, and space
  • Mathematical shape of something

meteor

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US / ˈmi:tiə(r) /

UK / ˈmitiɚ, -ˌɔr /

B2
  • noun
  • Rock from space that enters the Earth's atmosphere

scishow

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US / /

UK / /

A1

shockwave

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US / ʃɑkweɪv /

UK / ˈʃɑːkweɪv /

C2
  • noun
  • A wave of energy (e.g. after an earthquake)

radiate

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US / ˈreɪdieɪt /

UK / ˈrediˌet /

B1
  • verb
  • To show a lot of feeling clearly
  • To spread out from a center
  • To emit something like a wave

elongate

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US / ˈi:lɒŋgeɪt /

UK / ɪˈlɔ:ŋgeɪt /

C1
  • verb
  • To make something longer; to extend something

perpendicular

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US / ˌpɜ:pənˈdɪkjələ(r) /

UK / ˌpə:pənˈdɪkjəlɚ /

C1
  • adjecitve
  • Being at right angles to a given line or plane

geometric

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US / ˌdʒi:əˈmetrɪk /

UK / ˌdʒiəˈmɛtrɪk /

B2
  • adjecitve
  • With regular mathematical patterns/straight lines

meteorite

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US / ˈmi:tiəraɪt /

UK / ˈmitiəˌraɪt /

A1
  • noun
  • Rock from space that hits Earth's surface

skewed

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US / skjuːd /

UK / skjuːd /

C2
  • adjecitve
  • Not accurate or correct; biased
  • verb
  • To affect data making them incorrect or inaccurate
  • To affect ideas/thoughts making them incorrect

infer

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US / ɪn'fɜ:(r) /

UK / ɪnˈfɚ /

B1
  • verb
  • To reach a conclusion from the evidence
  • To imply; suggest something indirectly

latitude

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US / ˈlætɪtju:d /

UK / ˈlætɪtu:d /

B2
  • noun
  • Distance north or south of equator shown by a line
  • Freedom to act or choose without restrictions

venus

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US / ˈviːnəs /

UK / ˈviːnəs /

A1
  • other
  • The second nearest planet to the sun; it is peculiar in that its rotation is slow and retrograde (in
  • Type genus of the family Veneridae: genus of edible clams with thick oval shells

origami

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US / ˌɒrɪˈgɑ:mi /

UK / ˌɔ:rɪˈgɑ:mi /

C2
  • noun
  • Japanese art of folding paper into artistic shapes

elliptical

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US / ɪˈlɪptɪkl /

UK / ɪˈlɪptɪkl /

C1
  • adjecitve
  • Indirect
  • Making or drawn in an oval shape or movement

concave

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US / 'kɒn'keɪv /

UK / kɑnˈkev, ˈkɑnˌkev /

C1
  • adjecitve
  • Hollow; curved inward

oblong

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US / ˈɒblɒŋ /

UK / ˈɑ:blɔ:ŋ /

C1
  • adjecitve
  • (Of a shape) having four straight sides

impactor

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US / 'ɪmpæktə /

UK / 'ɪmpæktə /

A1
  • noun
  • An object (such as a meteorite) which collides with another body.
  • Introduction to Video Content
  • Why Are Craters Always Round?The solar system is a busy place, full of speedy space rocks that leave quite the mark when they smack into a planet or moon. These impacts create craters, but have you ever wondered why these craters are almost always round? Shouldn't the different angles at which meteorites and asteroids fall create more oblong craters?It turns out that while most craters are indeed round, there are some that exhibit an elliptical shape. These elliptical craters can provide valuable insights into the history of our solar system. To understand why craters are mainly round but occasionally elliptical, we need to look at the mechanics behind crater formation.When a meteor or asteroid collides with the ground, it releases an enormous amount of energy, similar to a bomb explosion. This energy creates a shockwave that radiates out in all directions from the point of impact. As a result, the circular shape of the crater is formed, regardless of the angle at which the rock fell.However, upon closer examination of celestial bodies like the Moon, Venus, and Mars, it becomes apparent that around 5% of craters exhibit an elliptical shape. The occurrence of elliptical craters can be attributed to the rock entering the atmosphere at a very shallow angle. In this scenario, different parts of the rock can hit different points on the surface, creating an elongated shockwave and resulting in an elliptical crater shape.While there is ongoing debate among scientists regarding the exact mechanics of elliptical crater formation, these unique craters provide valuable clues about the events that have shaped our solar system. By studying these craters, scientists can gain insights into the past impacts and dynamics of celestial objects in our solar system.In conclusion, the majority of craters in our solar system are round due to the shockwave created by the energy release upon impact. However, the presence of elliptical craters suggests a different angle of entry for the space rock, resulting in an elongated shockwave and an elliptical shape. Understanding the formation of these craters can provide valuable knowledge about our solar system's evolution and help scientists piece together the puzzle of its history.
  • Subtitles section
  • Thanks to Brilliant for supporting this SciShow video.
  • As a SciShow viewer, you can keep building your STEM skills with a 30-day free trial and 20% off an annual Premium subscription at Brilliant.org slash SciShow.
  • The solar system is a busy place, full of speedy space rocks that leave quite the mark when they smack into a planet or moon.
  • I'm talking about craters.
  • But wait, why are all of these near-perfect circles?
  • Meteorites and asteroids fall from the sky at all sorts of angles.
  • Shouldn't that make craters more oblong?
  • It turns out, they occasionally are.
  • And finding the odd elliptical crater on a rocky body can teach us some important things about our solar system's past.
  • INTRO It's pretty easy to make your own elliptical crater by throwing a rock into some mud.
  • But the stuff falling from space is traveling way faster than you could ever hope to throw anything—over 10 kilometers a second.
  • And when a super-speedy meteor or asteroid strikes the ground, the collision releases so much energy, it's basically like a bomb going off.
  • It creates a shockwave that clears the material from the crater.
  • In other words, it isn't the space rock itself that's pushing the ground out of the way.
  • And since shockwaves radiate out in all directions from a single point, you get a circular shape—even if the rock isn't falling straight down.
  • But if you look closely at the Moon, or Venus, or Mars, you'll see that around 5% of craters are somewhat elliptical.
  • How is that possible?
  • Well, there's debate over the specific mechanics, but if the rock comes in at a very shallow angle, different parts of the rock can hit different points on the surface, creating an elongated shockwave.
  • According to computer simulations, the angle can vary depending on the speed, size, and makeup of the space rock, as well as what its target is made out of.
  • But roughly, we're looking at around a maximum of 15 degrees.
  • And because we know elliptical craters can only form from shallow impacts, they can give us hints about a planet's history.
  • For example, back in 2018, one team of researchers used elliptical craters on Mars to infer how much the planet's tilt has changed over the past 3.5 billion years.
  • Just like Earth, Mars' spin axis isn't perpendicular to its path around the Sun, and the exact angle of its tilt changes over time.
  • Now, the majority of space impactors come from the fairly flat asteroid belt, so if a planet's tilt never changes, the number of shallow impacts for a given latitude should stay the same.
  • But if the tilt changes, you'd see either more or fewer elliptical craters, because the ground's now at a different angle to where asteroids come from.
  • So the team ran some simulations to see how many skewed craters ended up at different spots for different tilt angles, and then compared them to what Mars' surface actually looks like.
  • And they concluded that over the past 3.5 billion years, Mars has spent most of its time wobbling between a 10-degree to 30-degree tilt.
  • Which is very different from Earth, whose tilt only varies by a couple of degrees, likely because the tug of our large moon stabilizes any wobbling.
  • So there's still a lot for astronomers to learn, both about and from craters and their shapes.
  • It's the kind of research that leaves a bigger impact than you might think.
  • Thanks for watching this SciShow video, and thanks to Brilliant for supporting it.
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  • Literally.
  • They have a course called Beautiful Geometry.
  • That course helps you understand the concave geometry of something like a crater, along with so much more.
  • It's an engaging way to learn about geometry through origami folding and puzzles.
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  • From craters to geometric principles, there's beauty everywhere.