Question

Define oxygen cycle​

Answer 1

Explanation:

The oxygen cycle is the cycle that helps move oxygen through the three main regions of the Earth, the Atmosphere, the Biosphere, and the Lithosphere. ... This also has some free oxygen produced from photosynthesis and other life processes. The largest reservoir of oxygen is the lithosphere.Mar 30, 2010

Answer 2

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Oxygen cycle, circulation of oxygen in various forms through nature. Free in the air and dissolved in water, oxygen is second only to nitrogen in abundance among uncombined elements in the atmosphere. Plants and animals use oxygen to respire and return it to the air and water as carbon dioxide (CO2).

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