4.5 billion years ago the earth was a molten ball surrounded by hydrogen and helium.
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78% Nitrogen, 21% Oxygen, 1% trace gases
air is made up of some gases. i.e. it's made up of hydrogen, nitrogen, and mixture of other gases. but the most common is it is made up of nitrogen-78%, oxygen-21%, and other gases-1%air is made up of different gases such as oxygen, carbondioxide, nitrogen and noble gases.
Gases in air are nitrogen about 79%, oxygen about 20% and other gases 1%
billion air
in burning things, to breath in air etc.