Question

How often does oxygen cycle through the atmosphere?

Answer 1

the water which is released by the volcanoes undergoes disassociation due to cosmic radiations breaking into Oxygen and hydrogen. can oxygen become the part of the atmosphere.

.2

plants in the process of photosynthesis release oxygen into the air plants and animals in the cellular respiration burn oxygen taking oxygen out of the atmosphere which is than cellular respiration takes in and produces carbon dioxide which is used in photosynthesis to produce oxygen.

This is the explanation .Answer is .. Bye volcanic and organic reactions