In the atmosphere up to an altitude of about 80 km, oxygen (O2) makes up about __ % and nitrogen (N2) comprises about _% of the gases by volume:

In the atmosphere up to an altitude of about 80 km, oxygen (O2) makes up about __________ % and nitrogen (N2) comprises about _________% of the gases by volume:

asked Aug 2, 2021 211k views

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