The atmosphere surrounding the earth caused by the mass of gas enveloped the surface crust to rise to about 900 kilometers, and found the atmosphere with oxygen. Enough for the living of life is only 5-6 km from the Earth's surface
composition of air
, as known to contain gas in the air is 78 percent nitrogen, 21 percent oxygen gas. And the remaining 1 percent argon. Carbon dioxide and other gases Figure 23-15.
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