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| Condition of Earth's atmosphere at A PARTICULAR TIME AND PLACE. |
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| Covering of gases that surrounds the Earth. |
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Definition
| Form of oxygen that has 3 oxygen atoms. |
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Definition
| Lower part of thermosphere; Northern lights occur here; radio waves bounce off of it. |
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Definition
| Lower part of thermosphere; gradually blends w/ outer space. |
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Definition
| The pressing down of the weight of air on an area. |
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Definition
| Lowest level of atmosphere; most weather is here; contains most of the air's mass. |
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Definition
| Distance above sea level. |
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Definition
| Instrument that measures air pressure; 2 kinds, mercury and aneroid. |
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Definition
| 4th layer of Earth's atmosphere; has 2 parts, exosphere & ionosphere. |
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| 3rd layer of the Earth's atmosphere; protects Earth from meteoroids. |
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Definition
| 2nd layer of Earth's atmosphere; contains the ozone layer; protects us from dangerous radiations. |
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