Question

What is atmosphere? What are the important constituents of air?
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Answer 1

Answer:

the envelope of gases surrounding the earth or another planet.By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.