what is oxygen cycle
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The oxygen cycle is the biogeochemical cycle of oxygen within its four main reservoirs: the atmosphere, the total content of biological matter within the biosphere, the hydrosphere, and the lithosphere/Earth's crust.
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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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