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Geochemical cycle
In Earth science, a geochemical cycle is the pathway that chemical elements take in the surface and crust of the Earth.
The term "geochemical" tells us that geological and chemical factors are all included. The migration of heated and compressed chemical elements and compounds such as silicon, aluminium, and general alkali metals through the means of subduction and volcanism is known in the geological world as geochemical cycles.
The geochemical cycle encompasses the natural separation and concentration of elements and heat-assisted recombination processes. Changes may not be apparent over a short term, such as with biogeochemical cycles, but over a long term changes of great magnitude occur, including the evolution of continents and oceans.〔
==Differentiating biogeochemical cycles==
Some may use the terms biogeochemical cycle and geochemical cycle interchangeably because both cycles deal with Earth´s reservoirs. However, a biogeochemical cycle refers to the chemical interactions in surface reservoirs such as the atmosphere, hydrosphere, lithosphere, and biosphere whereas a geochemical cycle refers to the chemical interactions that exist in crustal and sub crustal reservoirs such as the deep earth and lithosphere.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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