In nature, oxygen is recycled through what is known as the Oxygen cycle. It is mainly recycled through the biosphere or living things. Animals consume much of the oxygen and produce carbon dioxide. In exchange, plants consume carbon dioxide through photosynthesis and produce oxygen. Oxygen can also be recycled between the biosphere and the lithosphere (the Earth’s crust). Marine animals often create shell material that are rich in oxygen. When they die, the shells become part of the ocean floor rock (usually limestone), and the oxygen is later released through weathering of the rock.
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