WHAT IS OXYGEN CYCLE?
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Oxygen Cycle is the biogeochemical cycle that describes the movement of oxygen within and between its 3 main reservoirs: the atmosphere, the content of biological and the lithosphere.
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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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