The circulation of chemical components through the biosphere from, or to, the lithosphere, atmosphere, and hydrosphere: The biogeochemical cycle includes the exchange of elements, like oxygen, carbon, or nitrogen, in the environment between storage pools, such as the atmosphere, biota, oceans, soils, the earth's crust, and human society.

In Earth science, the successive stages in the circulation and migration of chemical elements among the lithosphere, hydrosphere, and atmosphere during geological changes: The geochemical cycle is the route or the course that chemical elements travel in the surface and crust of the planet Earth.