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| Humans are made of CARBON. |
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| A sedimentary rock consisting primarily of calcium carbonate. |
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| A colourless odourless incombustible gas present in the atmosphere and formed during respiration. |
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| A weak acid formed when carbon dioxide combines with water. |
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| The circulation of carbon between living organisms and their surroundings. |
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| A colourless odourless relatively unreactive gaseous element that forms 78% of the atmosphere. |
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| The conversion of atmospheric nitrogen into compounds such as ammonia. |
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| Plants using the sun to create food. |
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| Process by which pollution from such sources as sewage effluent or leachate from fertilized fields causes a lake, pond, or fen to become overrich in organic and mineral nutrients, so that algae and cyanobacteria grow rapidly and deplete the oxygen supply. |
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| A marine ridge or reef consisting of coral and other organic material consolidated into limestone. |
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| An unstable, poisonous form of oxygen, O3, that is formed naturally in the ozone layer from atmospheric oxygen by electric discharge or exposure to ultraviolet radiation, also produced in the lower atmosphere by the photochemical reaction of certain pollutants. |
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| The radiation from the sun. |
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| A fuel source other than gasoline, and coal. |
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| An increase in the average temperature worldwide believed to be caused by the greenhouse effect. |
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| An open mine, especially a coal mine, whose seams or outcrops run close to ground level and are exposed by the removal of overlying soil and rock. |
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| A mixture of decaying organic matter, as from leaves and manure, used to improve soil structure and provide nutrients. |
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| The angular distance north or south of the earth's equator, measured in degrees along a meridian, as on a map or globe. |
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| Part of the Earth's surface between the Tropic of Cancer and the Tropic of Capricorn. |
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