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| water that falls to the Earth's surface |
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| a place where a liquid is collected and stored |
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| to go down suddenly, to decrease by a great amount in a short time |
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| able to decay naturally and in a way that is not harmful |
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| the number and types of plants and animals that exist in a particular area or in the world |
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| the part of the Earth's environment where life exists |
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| a device on a car that reduces the amount of poisonous gas that is released from the exhaust |
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| the act of sending out gas, heat, light, etc or an amount of gas, heat, light, etc. that is sent out |
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| of or connected with the heat inside the earth |
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| a dense (= heavy in relation to its size) and usually poisonous metal, such as lead |
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| a layer of oil that is floating over a large area of the surface of the sea |
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| the process by which land changes into desert |
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| a large area of land where wild animals can live in safety |
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| an official examination of the effect of a company’s business on the environment |
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| activities by a company or an organization that are intended to make people think that it is concerned about the environment |
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| violent activities which are done in order to draw attention to issues relating to the environment |
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| the Earth, considered as a single natural system which organizes and controls itself |
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| not causing very many problems or changes, especially in the environment |
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| the size of an earthquake |
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| a sudden disaster or a violent event that causes change |
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| a sudden very heavy fall of rain |
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| a small ball of ice that falls like rain |
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| a heavy fall of rain that often starts suddenly |
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| a public place for walking, usually a wide path beside the sea |
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| a line left or reached by the sea when the tide is at its highest point |
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| an area of open land near a coast that is regularly flooded by the sea |
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| an area where oil is found in the ground or under the sea |
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| a mass of small smooth stones on a beach or at the side of a river |
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| the dead body of an animal |
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| either of the two times of the year at which the sun reaches its highest or lowest point in the sky at midday |
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| the shadow made by the earth or the moon during a partial eclipse |
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