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| composition of the atmosphere |
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| made up of nitrogen, oxygen, carbon dioxide, water vapor, and many other gases |
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| condition of earths atmosphere |
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| envelope of gases that surrounds the planet |
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| form of oxygen that has three oxygen atoms in each molecule instead of the usual two |
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| importance of the earths atmosphere |
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| makes conditions on earth suitable for living things-providing warmth and liquid water |
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| amount of mass in a given volume of air |
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| force pushing on an area or surface |
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| result of weight of a column of air pushing down on an area |
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| elevation - or distance above sea level |
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| as air pressure decreases |
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| four main parts of the atmosphere |
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| troposphere, stratosphere, mesosphere, thermosphere |
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| layer in which earth's weather occurs |
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| 2nd layer of the atmosphere-contains the ozone |
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| temperature drops- layer that protects earths surface from being hit by meteoriods |
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| two layers - ionosphere, exosphere |
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| harmful substances in air, water, and soil |
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| natural and human activities |
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| forest fires, soil erosion, dust storms, and volcanoes |
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| burning fossil fuels causes |
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| brown haze that develops in sunny cities--light , yellow |
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| rain that contains more acid than normal |
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| in the u.s. the federal and state governments |
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| have passed a number of laws and regulations to reduce air pollution |
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