The term biogeochemicalcycles expresses the interactions among the organic (bio-) and inorganic (geo-) worlds, and focuses on the chemistry (chemical-), and movement (cycles) of chemical elements and compounds.
In studying biogeochemicalcycles, it is important to express in a common unit the amount of each element in all its phases and all its chemical compounds.
In ecology and Earth science, a biogeochemicalcycle is a circuit or pathway by which a chemical element or molecule moves through both biotic ("bio-") and abiotic ("geo-") compartments of an ecosystem.
The most well-known and important biogeochemicalcycles, for example, include the carbon cycle, the nitrogen cycle, the oxygen cycle, the phosphorus cycle, and the water cycle.
Biogeochemicalcycles always involve equilibrium states: a balance in the cycling of the element between compartments.
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