![]() The oxygen cycle is the biogeochemical cycle of oxygen atoms between different oxidation states in ions, oxides, and molecules through redox reactions within and between the spheres/reservoirs of the planet Earth. ![]() The oxygen cycle demonstrates how free oxygen is made available in each of these regions, as well as how it is used. ![]() Oxygen cycle refers to the movement of oxygen through the atmosphere (air), biosphere (plants and animals) and the lithosphere (the Earth’s crust). The rate of organic carbon burial was derived from estimated fluxes of volcanic and hydrothermal carbon. ![]() The value of photosynthesis or net primary productivity (NPP) can be estimated through the variation in the abundance and isotopic composition of atmospheric O 2. The major fluxes between these reservoirs are shown in colored arrows, where the green arrows are related to the terrestrial biosphere, blue arrows are related to the marine biosphere, black arrows are related to the lithosphere, and the purple arrow is related to space (not a reservoir, but also contributes to the atmospheric O 2). Main reservoirs and fluxes - in the biosphere (green), marine biosphere (blue), lithosphere (brown), and atmosphere (grey).
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