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The water cycle | Weather and climate | Middle school Earth and space science | Khan Academy

Video vocabulary

directly

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US / dəˈrektli /

UK / dɪˈrɛktli, daɪ- /

A2
  • adverb
  • In a frank and honest way
  • Right away; immediately

hard

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US / hɑ:d /

UK / hɑː(r)d /

A1
  • adjecitve
  • Difficult to do; difficult to understand
  • (Of facts) not able to be misunderstood; clear
  • (Of alcohol) strong
  • Involving or requiring lots of work, effort, care
  • Being full of pain, trouble, and problems
  • Strong
  • (Of edge) clear; sharp
  • Difficult to bend, break or cut; solid
  • adverb
  • With lots of force, power, or impact

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

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

glass

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US / ɡlɑ:s /

UK / ɡlæs /

A1
  • adjecitve
  • Being made of glass
  • noun
  • Clear hard container used for drinking
  • A lens for eyewear
  • Hard see-through material used for making windows

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

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

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

phase

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US / feɪz /

UK / fez /

A2
  • noun
  • Different stages of the moon from new to full
  • Distinct part or step in a process
  • One stage of a process or series of stages
  • verb
  • To make happen in a gradual ordered way

understanding

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US / ˌʌndəˈstændɪŋ /

UK / ˌʌndərˈstændɪŋ /

A1
  • adjecitve
  • Being sympathetic
  • noun
  • When you get the meaning correctly; comprehension
  • Knowledge about something or someone
  • verb
  • To know the meaning of language, what someone says

stoma

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US / ˈstəʊmə /

UK / ˈstoʊmə /

A1
  • noun
  • Minute epidermal pore in a leaf or stem through which gases and water vapor can pass

energy

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US / 'enədʒɪ /

UK / ˈɛnədʒi /

A2
  • noun
  • Physical or mental strength

enough

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US / ɪˈnʌf /

UK / ɪˈnʌf /

A1
  • adjecitve
  • Sufficient to answer the need
  • adverb
  • To a satisfactory degree
  • pronoun
  • Equal to what is needed; as much as required
  • Adequate number or amount

great

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US / ɡreɪt /

UK / ɡret /

A1
  • adjecitve
  • Very large in size
  • Very important
  • Very good; fantastic; wonderful
  • adverb
  • Very good; better than before
  • noun
  • Successful and well-admired person

mean

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US / mi:n /

UK / min /

A1
  • adjecitve
  • Being good at
  • Nasty; unkind
  • Not liking to spend money; cheap; stingy
  • noun
  • Average of a set of numbers
  • verb
  • To express a particular idea or thought
  • To intend to do something in particular
  • To have a particular meaning or value

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

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)

again

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US / ə'ɡen /

UK / əˈɡɛn /

A1
  • adverb
  • One more time, once more

different

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US / ˈdɪfrənt /

UK / ˈdɪfrənt /

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

current

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US / 'kʌrənt /

UK / ˈkɚrənt, ˈkʌr- /

A2
  • adjecitve
  • Happening or being in the present time
  • noun
  • Electricity flowing through wires
  • Movement of water in a river, or air in the sky

even

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US / 'i:vn /

UK / ˈivən /

A1
  • adjecitve
  • Being equal in influence, power, possibility etc.
  • Being divided equally or fairly
  • (Of teams/contest) with similar chances of success
  • Smooth, level, or regular
  • Can be divided by 2; ending in 2, 4, 6, 8, or 0
  • At a regular, equally steady manner
  • Remaining steady and unchanging
  • adverb
  • (When this is surprising) as well; too
  • (Used to compare two things/stress the difference)
  • verb
  • To make something level; to flatten
  • To make something equal

eventually

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US / ɪˈventʃuəli /

UK / ɪˈvɛntʃuəli /

A2
  • adverb
  • After a long time; after many attempts; in the end

health

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US / helθ /

UK / hɛlθ /

A1
  • noun
  • (Person, company) being in a good condition; well

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

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

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’

groundwater

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US / ˈgraʊndwɔ:tə(r) /

UK / ˈɡraʊndˌwɔtɚ, -ˌwɑtɚ /

A1
  • noun
  • Water beneath the earth's surface, often between saturated soil and rock, that supplies wells and sp

least

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US / li:st /

UK / list /

A1
  • adverb
  • In the smallest or lowest way
  • noun
  • Something that is of the lowest or smallest degree

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

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

geography

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US / dʒiˈɒgrəfi /

UK / dʒiˈɑ:grəfi /

B1
  • noun
  • Study of the earth and its natural features

sometimes

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US / ˈsʌmtaɪmz /

UK / ˈsʌmˌtaɪmz /

A1
  • adverb
  • Only at certain times; occasionally

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

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

icy

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US / 'aɪsɪ /

UK / ˈaɪsi /

A2
  • adjecitve
  • Very cold; with frozen water on it, or in it
  • Not very friendly or kind

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

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

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

until

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US / ənˈtɪl /

UK / ʌnˈtɪl /

A1
  • conjunction
  • Up to; to a time when something happens
  • preposition
  • Before (a specific time)

droplet

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US / ˈdrɒplət /

UK / ˈdrɑ:plət /

B1
  • noun
  • Small drop

crystallize

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US / ˈkrɪstəlaɪz /

UK / ˈkrɪstəˌlaɪz /

C2
  • verb
  • To make a substance form into crystals
  • To make something clear or easy to understand

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

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

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

condensation

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US / ˌkɒndenˈseɪʃn /

UK / ˌkɑ:ndenˈseɪʃn /

B2
  • noun
  • Act of shortening something
  • Drops of water on a surface, as produced by steam
  • Process by which a gas becomes a liquid

from

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US / frəm /

UK / frʌm, frɑm,frəm /

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

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

hot

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US / hɒt /

UK / hɑ:t /

A1
  • adjecitve
  • Angry or excited
  • Being very good at something
  • Having a high temperature
  • Popular and causing a great deal of excitement
  • Attractive in a sexually exciting way
  • (Of food) very spicy
  • Stolen; dangerous to buy or trade in

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

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

resource

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US / riˈsɔ:s /

UK / ˈriˌsɔrs, -ˌsors, -ˌzɔrs, -ˌzors, rɪˈsɔrs, -ˈsors, /

A2
  • noun
  • Something that can be used profitably; asset
  • An essential supply of something
  • Resourcefulness; ability to deal with problems
  • verb
  • To obtain (e.g. oil, gas) from its source

temperature

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US / ˈtemprətʃə(r) /

UK / ˈtɛmpərəˌtʃʊr,-tʃɚ,ˈtɛmprə- /

A2
  • noun
  • When you your body heat is above normal
  • How hot or cold something is, e.g. the weather

drink

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US / drɪŋk /

UK / drɪŋk /

A1
  • noun
  • A liquid that you put in your mouth
  • verb
  • To put water in your body through your mouth

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

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

may

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US / meɪ /

UK / me /

A1
  • noun
  • 5th month of the year
  • other
  • Used to express a desire
  • Expresses permission, possibility or probability
  • Used to show that a thing could be true

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

essential

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US / ɪ'senʃl /

UK / ɪˈsɛnʃəl /

A2
  • adjecitve
  • Extremely or most important and necessary

glacier

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US / ˈglæsiə(r) /

UK / ˈgleɪʃər /

B2
  • noun
  • Very large river of ice moving down a mountain

plant

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US / plɑ:nt /

UK / plænt /

A2
  • noun
  • Factory or a place where things are made
  • Living thing with leaves and roots growing in soil
  • verb
  • To firmly position something (in the ground)
  • To put seeds, flowers, trees in the ground

state

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US / steɪt /

UK / stet /

A1
  • adjecitve
  • Concerning region within a country
  • noun
  • Region within a country, with its own government
  • Situation or condition something is in
  • verb
  • To say; declare as fact

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)

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

you

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US / jʊ /

UK / ju /

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

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.

three

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US / θri: /

UK / θri /

A1
  • number
  • Number 3

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

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

less

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US / les /

UK / lɛs /

A1
  • adjecitve
  • Smaller in amount or degree
  • adverb
  • To a smaller degree
  • noun
  • A smaller amount
  • preposition
  • With the subtraction of

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

pull

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US / pʊl /

UK / pʊl /

A1
  • noun
  • Act of breathing in smoke, as from a pipe
  • Force something has that draws other things to it
  • Using your hands to move something to you
  • verb
  • To breathe in smoke, as from a pipe
  • To hold something and move it toward you
  • To remove something by force

one

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US / wʌn /

UK / wʌn /

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

open

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US / 'əʊpən /

UK / ˈopən /

A1
  • adjecitve
  • Available for use; accessible
  • Not being hidden; available for others to see
  • Being available for customers to enter or use
  • Allowing everyone to use or take part in
  • Not secret anymore
  • Not closed or shut
  • Willing to accept new ideas and thoughts
  • noun
  • Name for a tennis or golf competition
  • verb
  • To make accessible or able to be used, e.g. road
  • To start the activities or services of a business
  • To make a space or hole appear in something
  • To move or change so that it is no longer closed
  • To start something, e.g. a new business

root

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US / ru:t /

UK / rut, rʊt /

A2
  • noun
  • Emotional connection with a place, history etc.
  • The origin or starting place of something
  • A number that is multiplied by itself
  • Part of plant growing underground, as to get water
  • Part of tooth, hair etc. from which the rest grows
  • Base part of a word to which affixes can be added
  • verb
  • To cause a plant to develop or grow roots
  • (Animals) to search for e.g. food in earth
  • To stop someone moving, as through fear

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

than

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US / ðən /

UK / ðən /

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

cloud

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US / klaʊd /

UK / klaʊd /

A1
  • noun
  • A mass of smoke or mist hanging in the air
  • verb
  • To confuse the mind/judgment of a person
  • (Of the sky) to get darker and fill with clouds
  • To make (glass, etc.) difficult to see through
  • To make an activity less pleasant or enjoyable
  • (Of person's face, etc.) to show worry/anger

collect

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US / kəˈlekt /

UK / kəˈlɛkt /

A2
  • adverb
  • By asking the receiver of a call to pay for it
  • verb
  • To ask for money, e.g. for a charity
  • To gather things, people together in one place
  • To get and keep one type of things as a hobby
  • To take things and bring them together
  • To go and receive, e.g. a prize or an award
  • To take control of your own feelings or thoughts

wide

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US / waɪd /

UK / waɪd /

A1
  • adjecitve
  • Having a great distance from one side to the other
  • adverb
  • Fully; completely

food

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US / fu:d /

UK / fud /

A1
  • noun
  • What people and animals eat to live
  • Things taken in by plants to maintain life
  • A particular style or type of cooking, e.g. Asian

maybe

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US / ˈmeɪbi /

UK / ˈmebi /

A1
  • adverb
  • Possibly but not certainly; perhaps

whole

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US / həul /

UK / hol /

A1
  • adjecitve
  • Complete or full; all of
  • Being in a good condition
  • noun
  • Complete amount or sum; total

transportation

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US / ˌtrænspɔ:ˈteɪʃn /

UK / ˌtrænspɔ:rˈteɪʃn /

B1
  • noun
  • Act of moving people or goods between places

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

really

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US / ˈri:əli /

UK / ˈriəˌli, ˈrili /

A1
  • adverb
  • Used to stress something that is said; definitely
  • In a true or accurate manner
  • Very

but

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US / bət /

UK / bʌt,bət /

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

especially

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US / ɪˈspeʃəli /

UK / ɛˈspɛʃəli, ɪˈspɛʃ- /

A1
  • adverb
  • More than usual; extremely

life

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US / laɪf /

UK / laɪf /

A1
  • noun
  • All the living things e.g. animals, plants, humans
  • Period of time things live, from birth to death

river

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US / ˈrɪvə(r) /

UK / ˈrɪvɚ /

A1
  • noun
  • Flowing water that runs from mountains to the sea

underground

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US / ˈʌndəgraʊnd /

UK / ˈʌndərgraʊnd /

B1
  • adjecitve
  • (Being or living) under the surface of the earth
  • noun
  • Secret group organized to overthrow a government
  • Subway system, e.g. in London

become

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US / bɪ'kʌm /

UK / bɪˈkʌm /

A1
  • verb
  • To begin to be; grow to be; develop into
  • To be suitable for a particular job or role

same

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US / seɪm /

UK / sem /

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

tiny

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US / 'taɪnɪ /

UK / ˈtaɪni /

A2
  • adjecitve
  • Very, very small

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

here

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US / hɪə(r) /

UK / hɪr /

A1
  • adverb
  • In this place; at this location, position or time

production

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US / prəˈdʌkʃn /

UK / prəˈdʌkʃən, pro- /

A2
  • noun
  • Process of producing or growing food naturally
  • Process of making something on a large scale
  • Process of making a movie or TV show

fresh

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US / freʃ /

UK / frɛʃ /

A1
  • adjecitve
  • Clean; not used or dirty
  • Remaining clear, as in a person's memory
  • Newly made or gathered
  • (Water) not salty, usually from a lake or a river

liquid

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US / ˈlɪkwɪd /

UK / ˈlɪkwɪd /

A2
  • adjecitve
  • (Of wealth) being able to be spent as cash
  • In a state of being uncertain
  • Moving in a flowing manner, like water or oil
  • noun
  • Something that is similar to the state of water

many

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US / 'menɪ /

UK / ˈmɛni /

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

thousand

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US / ˈθaʊznd /

UK / ˈθaʊzənd /

A1
  • number
  • Number 1,000

weather

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US / 'weðə(r) /

UK / ˈwɛðɚ /

A1
  • noun
  • Whether it is raining, sunny, cold etc. outside
  • verb
  • To successfully deal with a difficult situation
  • To erode or become damaged due to the environment

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

day

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US / deɪ /

UK / de /

A1
  • noun
  • A period of 24 hours beginning at midnight
  • The period of time when it is light outside
  • Person's name

actually

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US / ˈæktʃuəli /

UK / ˈæktʃuəli /

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

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

economy

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US / ɪ'kɒnəmɪ /

UK / ɪˈkɑnəmi /

A1
  • noun
  • Using money, resources in a careful, effective way
  • Total of all goods, services and wages in an area

heat

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US / hi:t /

UK / hit /

A2
  • noun
  • State of anger, excitement, or arguing
  • Particular temperature at which to cook something
  • High temperature
  • One of series of races to find the finalists
  • Hot temperature, conditions, or weather
  • verb
  • To make hot or hotter

gravity

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US / ˈgrævəti /

UK / ˈɡrævɪti /

B1
  • noun
  • (Of a situation) extreme seriousness
  • Force making things fall towards the ground

million

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US / ˈmɪljən /

UK / ˈmɪljən /

A1
  • number
  • 1,000,000

vapor

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US / 'veɪpə /

UK / ˈvepɚ /

A1
  • noun
  • Tiny droplets or pieces of some substance spread thinly throughout the air
  • Liquid that has been changed into a gas
  • Droplets of substance spread thinly through air

complicated

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US / 'kɒmplɪkeɪtɪd /

UK / ˈkɑmplɪˌketɪd /

B1
  • adjecitve
  • Difficult to do, understand or use
  • verb
  • To make more difficult to do, understand or use

flow

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US / fləʊ /

UK / flo /

A2
  • noun
  • Amount of something that moves through an area
  • verb
  • To move steadily and easily in a certain direction

population

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US / ˌpɒpjuˈleɪʃn /

UK / ˌpɑpjəˈleʃən /

A2
  • noun
  • Number of people who live in a country, area etc.

snow

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US / snəʊ /

UK / sno /

A1
  • noun
  • Person's name
  • White ice crystals that fall from the sky
  • verb
  • (Of ice crystals) to fall to the ground
  • To fool into believing something untrue

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

everyone

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US / ˈevriwʌn /

UK / ˈɛvriˌwʌn /

A1
  • pronoun
  • Every person; everybody

drop

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US / drɒp /

UK / drɑp /

A1
  • noun
  • Distance between a higher and a lower level
  • Act of letting something fall (from your hand)
  • A decrease in quantity or quality; reduction
  • Tiny amount of liquid, with rounded bottom
  • verb
  • To drive someone to a place and then drive away
  • To let something fall from your hand
  • To fall or lie down quickly, as when shot
  • To decide to stop something e.g. a course)
  • To (cause to) reduce in quantity or quality

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”

return

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US / rɪ'tɜ:n /

UK / rɪ'tɜ:rn /

A1
  • adjecitve
  • Do again; repeated
  • noun
  • Faulty or unwanted product sent back to a company
  • Enter key; the main key on the computer keyboard
  • Profit made as a result of a business activity
  • Process of going back to a previous way or state
  • verb
  • To hit something back to the other player or team
  • To come back after being away from somewhere
  • To repay someone's actions, kindness etc.
  • To put, bring, take, give, or send something back
  • To occur again

old

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US / əʊld /

UK / old /

A1
  • adjecitve
  • Having existed for a long time, not young or new
  • Age of a person since birth

naturally

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US / ˈnætʃrəli /

UK / ˈnætʃərəli, ˈnætʃrə- /

A2
  • adverb
  • In the expected or usual way
  • Without the aid of someone or something

work

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US / wɜ:k /

UK / wɚk /

A1
  • adjecitve
  • Activity completed in order to make money
  • noun
  • The product of some artistic or literary endeavor
  • Everything created by an author, artist, musician
  • Activity you do in order to make money
  • Place of employment
  • Final product or result of a some labor or effort
  • verb
  • To bring into a specific state of success
  • To be functioning properly, e.g. a car
  • To do your job in your company or workplace
  • To make an effort to do something
  • To operate a machine or device

dense

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US / dens /

UK / dɛns /

B1
  • adjecitve
  • Very thick and difficult to see, get through
  • Hard to understand
  • Uncomprehending; foolish; inconsiderate

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

solar

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US / 'səʊlə(r) /

UK / ˈsolɚ /

B1
  • adjecitve
  • Concerning the sun, or its heat

ago

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US / əˈgəʊ /

UK / əˈgoʊ /

A1
  • adverb
  • At a specified length of time in the past

lake

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US / leɪk /

UK / lek /

A2
  • noun
  • Large area of water surrounded by land

move

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US / mu:v /

UK / muv /

A1
  • noun
  • Act of moving a playing piece in chess, etc.
  • An action; doing something
  • Step taken to achieve a goal
  • verb
  • To cause someone to have certain emotions
  • To cause something to change to a different place
  • To change where people live or a business operates
  • To take action to do or achieve something

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

believe

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US / bɪ'li:v /

UK / bɪˈliv /

A1
  • verb
  • To think or accept that something is true
  • To have a particular opinion about something

aquifer

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US / ˈækwɪfə(r) /

UK / ˈækwəfɚ, ˈɑkwə- /

B2
  • noun
  • Water-bearing layer of rock, sand, or gravel

recreation

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US / ˌrekriˈeɪʃn /

UK / ˌrɛkriˈeʃən /

B1
  • noun
  • Activities done for pleasure or to relax

add

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US / æd /

UK / æd /

A1
  • verb
  • To include as well
  • To put two things or numbers together, e.g. 2+2

condense

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US / kənˈdens /

UK / kənˈdɛns /

B2
  • verb
  • To remove water from to make it thicker
  • To shorten (a book, etc.) by removing part of it
  • To change from gas to liquid or liquid to solid

bring

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US / brɪŋ /

UK / brɪŋ /

A1
  • verb
  • To take or go with someone to a place

take

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US / teɪk /

UK / tek /

A1
  • noun
  • Filming of a single scene for TV or the movies
  • verb
  • To accept something that is offered
  • To use a method of traveling, e.g. a bus or train
  • To use a camera to make (a photo)
  • To pick up something and go away with it
  • To study a subject in school
  • To attempt to pass (an exam)
  • To require a certain amount of time, money, space

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

billion

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US / ˈbɪljən /

UK / ˈbɪljən /

A2
  • noun
  • Number 1,000,000,000

they

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US / ðeɪ /

UK / ðe /

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

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

absorb

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US / əb'sɔ:b /

UK / əbˈsɔrb, -ˈzɔrb /

B1
  • verb
  • To take up all attention / energy of something
  • To take in a liquid; soak up

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

simple

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US / 'sɪmpl /

UK / ˈsɪmpəl /

A1
  • adjecitve
  • Not hard to understand or do; not complex
  • Having only a few parts; not complex
  • Being ordinary or normal
  • Being plain; without a lot added for style

cool

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US / ku:l /

UK / kul /

A1
  • adjecitve
  • Steady and calm when facing difficulties
  • Almost cold; not warm or hot
  • Smart or stylish in a way (young) people admire
  • Unfriendly in an indirect way; distant
  • verb
  • To make something decrease in temperature
  • (Of an emotion, etc.) to become less strongly felt

limited

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US / ˈlɪmɪtɪd /

UK / ˈlɪmɪtɪd /

B1
  • adjecitve
  • (Of a company) with a limit of financial liability
  • With restrictions; not broad in scope
  • verb
  • To stop or prevent an increase past a point

steam

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US / sti:m /

UK / stim /

A2
  • adjecitve
  • (Train, engine) powered by boiling water
  • noun
  • Mist collecting on a surface when wet air cools
  • Source of stamina, strength or energy
  • Mist of water in the air formed when water boils
  • verb
  • To cover a surface with steam, so as to clean it
  • To cook in mist of tiny drops from boiling water
  • To produce or give off a hot gas by boiling liquid
  • To travel or move using steam as a force

warm

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US / wɔ:m /

UK / wɔrm /

A1
  • adjecitve
  • Friendly, sincere and kind to others
  • Being friendly or sincere
  • Slightly hot; not very hot
  • verb
  • To become more friendly or to like something
  • To make something hotter

water

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US / 'wɔ:tə(r) /

UK / ˈwɔtɚ, ˈwɑtɚ /

A1
  • noun
  • Clear liquid that forms the seas, rivers and rain
  • Large area such as an ocean or sea
  • verb
  • (Of the eyes) to produce tears
  • (Mouth) to become wet at the thought of nice food
  • To pour liquids onto a plant to keep it alive

grow

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US / ɡrəʊ /

UK / ɡro /

A1
  • verb
  • To get bigger and more mature; make plants do this
  • To improve; to develop better skills over time
  • To develop and become bigger or taller over time

land

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US / lænd /

UK / lænd /

A1
  • noun
  • Region or country
  • Earth; the ground
  • verb
  • To arrive or cause a boat to arrive at the shore
  • To obtain or get something that you wanted
  • To (cause to) come down to the ground safely
  • To cause to arrive in a specific place or state

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

depend

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US / dɪˈpend /

UK / dɪˈpend /

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

microwave

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US / ˈmaɪkrəweɪv /

UK / ˈmaɪkrəˌwev /

B1
  • noun
  • Cooking appliance using electromagnetic waves
  • Concerning electromagnetic radiation
  • verb
  • To heat or cook something in a microwave

cold

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US / kəʊld /

UK / kold /

A1
  • adjecitve
  • Having a very low temperature
  • Being unfriendly or lacking emotion
  • noun
  • Illness of sneezing, coughing, and a sore throat

constant

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US / 'kɒnstənt /

UK / ˈkɑnstənt /

A2
  • adjecitve
  • Happening frequently or without pause
  • noun
  • Thing that happens always or at a regular rate

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

fact

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US / fækt /

UK / fækt /

A1
  • noun
  • Something that is known or proved to be true

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

ocean

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US / 'əʊʃn /

UK / ˈoʃən /

A2
  • noun
  • Large body of salt water; a large sea

under

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US / ˈʌndə(r) /

UK / ˈʌndɚ /

A1
  • adjecitve
  • In the same place as another thing, but lower
  • adverb
  • In a lower quantity or price than expected
  • preposition
  • According to the terms of an agreement or law
  • Managed or controlled by the authority of
  • Being of a lesser quality or amount than expected
  • Influenced or affected by something or someone
  • Less or lower in age, amount, size or number

amount

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US / ə'maʊnt /

UK / əˈmaʊnt /

A1
  • noun
  • Quantity of something
  • verb
  • To add up to a certain figure

evaporation

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US / ɪˌvæpə'reɪʃn /

UK / ɪˌvæpəˈreʃən /

B2
  • noun
  • Changing from a liquid into a gas, e.g. steam

light

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US / laɪt /

UK / laɪt /

A1
  • adjecitve
  • Being bright making it easy to see; not dark
  • Being pale and lacking darkness of color
  • Not heavy; weighing only a little
  • adverb
  • Carrying few bags when traveling
  • noun
  • A source of energy that makes a room or area bright
  • Way in which something or someone is understood
  • verb
  • To cause something to burn; put a burning match to
  • To provide a way to see ahead

though

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US / ðəu /

UK / ðo /

A1
  • adverb
  • Although, despite the fact that

for

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US / fə(r) /

UK / fɔr,fə /

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

melt

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US / melt /

UK / mɛlt /

B1
  • verb
  • To disappear or to go away
  • To make, become soft or liquid due to heat
  • To become liquid through heating

solid

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US / 'sɒlɪd /

UK / ˈsɑlɪd /

A2
  • adjecitve
  • Being able to be trusted; reliable
  • Substance that is hard or of fixed shape
  • Being well made and expected to last long
  • Having no space or emptiness inside
  • Being made entirely of one material or substance
  • noun
  • Something firm or hard; not gas or liquid

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

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

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)

cycle

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US / ˈsaɪkl /

UK / ˈsaɪkəl /

A2
  • noun
  • Series of regular and repeated actions
  • Bicycle, bike
  • verb
  • To go through a series of events repeatedly
  • To ride on a bicycle

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)

air

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US / eə(r) /

UK / er /

A1
  • noun
  • Mixture of gases around the earth that we breathe
  • A person's manner intended to impress others
  • verb
  • To expose to the outside, to dry or freshen
  • To broadcast a TV or radio show
  • To open a subject to discussion and debate

recycle

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US / ˌri:'saɪkl /

UK / riˈsaɪkəl /

A2
  • verb
  • To use old ideas or concepts again
  • To send used things to be turned into new things

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

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

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

substance

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US / 'sʌbstəns /

UK / ˈsʌbstəns /

A2
  • noun
  • Essence of; most basic or central qualities
  • Particular type of material
  • Having material form; existing
  • Quality of truth, importance, or meaningfulness

seep

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US / si:p /

UK / sip /

B2
  • verb
  • To flow slowly through small openings or pores

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)

transition

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US / trænˈzɪʃn /

UK / trænˈzɪʃən, -ˈsɪʃ- /

B1
  • noun
  • Change from one state, movement, place to another
  • verb
  • To change state, movement, place, or subject

process

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US / prə'ses /

UK / ˈprɑsˌɛs, ˈproˌsɛs /

A2
  • noun
  • Dealing with official forms in the way required
  • Set of changes that occur slowly and naturally
  • verb
  • To organize and use data in a computer
  • To deal with official forms in the way required
  • To prepare by treating something in a certain way
  • To adopt a set of actions that produce a result
  • To convert by putting something through a machine

via

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US / ˈvaɪə /

UK / ˈvaɪə, ˈviə /

B1
  • preposition
  • By the means of using something
  • By going through, by way of

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

estimate

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US / 'estɪmət /

UK / ˈɛstəˌmet /

A2
  • noun
  • Guess or calculation of cost, size or value
  • verb
  • To guess or calculate the cost, size or value of

world

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US / wɜ:ld /

UK / wɜrld /

A1
  • noun
  • All the humans, events, activities on the earth
  • Political division due to some kind of similarity

agriculture

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US / ˈægrɪkʌltʃə(r) /

UK / ˈæɡrɪˌkʌltʃɚ /

A2
  • noun
  • The science of farming

exist

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US / ɪɡ'zɪst /

UK / ɪɡˈzɪst /

A1
  • verb
  • To be present, alive or real

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

ice

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US / aɪs /

UK / aɪs /

A1
  • noun
  • Frozen gas or liquid, esp. water
  • Sweet food made of frozen cream, or juices
  • verb
  • To make something cold by putting on frozen water
  • To spread a sweet and creamy substance on a cake

next

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US / nekst /

UK / nɛkst /

A1
  • adverb
  • The one that follows another in time or order
  • At a time or place directly after the present one
  • noun
  • The one that follows after
  • adjecitve
  • Immediately after the previous one
  • First occurrence after the present one

scientist

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US / ˈsaɪəntɪst /

UK / ˈsaɪəntɪst /

A2
  • noun
  • Person who is trained in a science

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

hole

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US / həʊl /

UK / hol /

A2
  • noun
  • An empty space, as in the ground, in a sock etc.
  • Fault or weakness in a plan, idea or explanation
  • Opening into or through something
  • An awkward or difficult situation
  • Dirty or unpleasant place with poor facilities
  • verb
  • (Golf) to get the ball into the hole

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
  • Introduction to Video Content
  • The water cycle, also known as the hydrologic cycle, is the continuous movement of water between different parts of the Earth system, including the atmosphere, land, and oceans. It is a fundamental process that plays a crucial role in weather and climate patterns. This article explores the water cycle and how water continuously moves from the ground to the atmosphere and back again.Did you know that the water you drink is actually the same water that dinosaurs drank over 65 million years ago? It might be hard to believe, but your water is actually really, really old. In fact, water on Earth is much older than the dinosaurs. Scientists estimate that the water on Earth is at least 4.6 billion years old. And the amount of water on Earth today, in lakes, rivers, oceans, glaciers, even under the ground and up in the clouds, it's about the same as it was millions and millions of years ago. That's because water is recycled. It just gets used again and again.Water is the only substance on Earth that naturally exists in three states: solid, liquid, and gas. This is due to the unique properties of water molecules. Have you seen water in all of its different states? Maybe on a hot day, you'll add some ice, which is water in its solid state, to a glass of liquid water. Or, maybe when you take out some food that you've heated in the microwave, you'll see steam coming off of the food, which is water in its gas state as water vapor.When you think of water, you might think of the wide open ocean. Over 95% of all the water on Earth is in the ocean, making it a great place to start with the water cycle. Here, energy from the sun warms up water on the surface of the ocean enough to turn it into water vapor. This process is called evaporation. The water vapor is less dense, meaning it's lighter, than liquid water, so it rises up and up into the atmosphere.However, as the water vapor rises, the temperature in the atmosphere cools. In turn, the water vapor condenses into tiny liquid water droplets, or clouds. This process is called condensation. These clouds can eventually lead to precipitation, which is when the water droplets in the clouds become too heavy and fall back to the Earth as rain, snow, sleet, or hail. This brings the water back to the ground, completing the water cycle.The water cycle is a complex and interconnected system that involves various processes, including evaporation, condensation, precipitation, and runoff. It is influenced by factors such as temperature, humidity, wind, and topography. The water cycle plays a crucial role in maintaining the Earth's climate and distributing water resources across the planet.Understanding the water cycle is important not only for understanding weather patterns but also for addressing water scarcity and managing water resources. By studying the water cycle, scientists can develop models and predictions to better understand and forecast weather events, track the movement of pollutants in water systems, and assess the impact of climate change on water availability.In conclusion, the water cycle is a fascinating and essential process that has been occurring on Earth for billions of years. It is responsible for the continuous movement and distribution of water across the planet. By learning about the water cycle, we can gain a deeper understanding of the Earth's interconnected systems and the delicate balance that sustains life on our planet.
  • Subtitles section
  • Did you know that the water you drink is actually the same water that dinosaurs drank over 65 million years ago?
  • It might be hard to believe, but your water is actually really really old.
  • In fact, water on earth is much older than the dinosaurs.
  • Scientists estimate that the water on earth is at least 4.6 billion years old.
  • And the amount of water on earth today, in lakes, rivers, oceans, glaciers, even under the ground and up in the clouds, it's about the same as it was millions and millions of years ago.
  • That's because water is recycled.
  • It just gets used again and again.
  • And that brings us to the water cycle, which is how water continuously moves from the ground to the atmosphere and back again.
  • And, as water moves through this cycle, it changes form.
  • In fact, water is the only substance on earth that naturally exists in three states, solid, liquid, and gas.
  • Have you seen water in all of its different states?
  • Maybe on a hot day, you'll add some ice, which is water in its solid state, to a glass of liquid water.
  • Or, maybe when you take out some food that you've heated in the microwave, you'll see steam coming off of the food, which is water in its gas state as water vapor.
  • When you think of water, you might think of the wide open ocean.
  • Over 95% of all the water on earth is in the ocean.
  • So this is a great place to start with the water cycle.
  • Here, energy from the sun warms up water on the surface of the ocean enough to turn it into water vapor.
  • This is called evaporation.
  • This water vapor is less dense, meaning it's lighter, than liquid water, so it rises up and up into the atmosphere.
  • However, as the water vapor rises, the temperature in the atmosphere cools.
  • In turn, the water vapor condenses into tiny liquid water droplets, or, as we see them, clouds.
  • This is called condensation.
  • Air currents then move these clouds all around the earth.
  • As a cloud collects more and more liquid water droplets, the water may be released from the cloud, pulled down by gravity, and then return to the ocean or land as precipitation, like rain.
  • If it's really cold, though, the water drops may crystallize and become snow.
  • The snow will fall to the ground and eventually melt back into a liquid and run off into a lake or river, pulled down by gravity, which flows back into the ocean, where the whole process starts over again.
  • But that's just one path water can take through the water cycle.
  • It's like a choose-your-own-adventure.
  • Instead of snow melting and running off into a river, the snow could become part of an icy, cold glacier and stay there for a long, long time, for thousands of years.
  • Or, rain can seep into the ground and become groundwater, where it's then absorbed by plant roots.
  • In turn, through transpiration, the water absorbed by the plants can transition to water vapor and leave directly through the leaves via tiny holes called stomata and return to the atmosphere.
  • Or, instead of being absorbed by plant roots, the groundwater can work its way to an underground aquifer or a lake, river, or even the ocean.
  • There are many different paths for water, and the water cycle can be very complicated.
  • But it really comes down to something very simple.
  • The amount of water on Earth stays pretty constant over time and moves from place to place, sometimes transitioning between phases, depending on things like weather, geography, solar energy, and gravity.
  • Now, we know that water is essential to life on Earth, and fresh water is an especially limited resource for a growing world population.
  • Changes in the water cycle can impact everyone through the economy, energy production, health, recreation, transportation, agriculture, and of course, drinking water.
  • And that's why understanding the water cycle is so important.
  • That, and it's pretty cool to know that you drink the same water as dinosaurs did.
  • Until next time!