1；name the two chemical elements that make up of Earth's atm

1；name the two chemical elements that make up of Earth's atmosphere.
2:in which layer of the atmosphere do people live?
3:what is atmospheric pressure?
4:what does a barometer measure?
5:what term is used for the amount of water vapour carried in air?
6:what does the Coriolis effect do to winds in the northern hemisphere?
7:what causes jet streams?
8:what is the name for the boundary between air masses?
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