Biogeochemical cycles

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In ecology, a biogeochemical cycle or nutrient cycle is a pathway by which a chemical element or molecule moves through both the biotic and abiotic categories. In effect, the element is recycled, although in some cycles there may be places (called reservoirs) where the element is accumulated or held for a long period of time. Elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the ecosystem to another through the biogeochemical cycles.

The most well-known and important biogeochemical cycles include the carbon, nitrogen, oxygen, phosphorus, sulfur, and water cycles.