what is the composition of the earth 's atmosphere?
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Composition of air
Oxygen — 21 percent. Argon — 0.93 percent. Carbon dioxide — 0.04 percent. Trace amounts of neon, helium, methane, krypton and hydrogen, as well as water vapor.
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Atmosphere comprises of various gases, hence it is a mixture of various gaseous particles which includes nitrogen, oxygen, argon etc. It is a heterogeneous mixture having different gases of different densities
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