| Main
Constituents of the Earth’s Atmosphere |
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| Nitrogen 78% |
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| Oxygen 21% |
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| Argon 1% |
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| Water Vapor 0-4% |
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| Carbon
Dioxide 0.036% (increasing) |
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| Nitrogen,
Oxygen, and Argon hardly interact with |
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| radiation. On the other hand water vapor and carbon |
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| dioxide both
interact with infrared radiation---the type |
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| emitted by the earth
and its atmosphere. |
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