Biogeochemical cycles are pathways that chemicals take as they move between living organisms and environment. Some well-defined biogeochemical cycles include the water cycle, the carbon cycle and the nitrogen cycle.

A biogeochemical cycle is made up of compartments or pools (e.g. the atmosphere, the oceans, forests, soils) in which the concentration of a particular substance can be measured or estimated, and transfer pathways, for which we attempt to measure or calculate the direction and rate of flow.

Biogeochemistry is the study of these cycles.

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