2. Two earth's atmosphere.a)b)

1.	2. Two earth's atmosphere.a)b)
Answer» tion:Earth's atmosphere is a LAYER of gases surrounding the planet Earth and retained by the Earth's gravity. It contains roughly 78% nitrogen and 21% oxygen 0.97% argon and CARBON DIOXIDE 0.04% TRACE AMOUNTS of other gases, and water vapor. This mixture of gases is commonly known as air.hope it helps

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