The natural cycles formed when nutrients enter an ecosystem, interact with the biomass, and then exit. Two of the major biogeochemical cycles on which life depend are the nitrogen cycle and the carbon cycle.

The movement of massive amounts of carbon, nitrogen, oxygen, hydrogen, calcium, sodium, sulfur, phosphorus, and other elements among various living and non-living components of the environment -- including the atmosphere, soils, aquatic systems, and biotic systems -- through the processes of production and decomposition.

Movement of elements through living organisms and the physical environment.