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Sequential changes in the form of specific elements, passing through both biotic and abiotic components of environments, including storage as rocks or in atmospheric or aquatic reservoirs.
With a biogeochemical cycle the basic idea of chemical cycling is joined by the role of organisms in cycling chemicals along with the impact of geological processes, which can both bury and then return nutrients to the Earth's surface.
Key biogeochemical cycles are the carbon cycle, the nitrogen cycle, the phosporus cycle, and indeed the water cycle. See also nutrient cycling.
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