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.
12.
;Lithoautotroph : An organism ( usually bacteria ) whose sole source of carbon is carbon dioxide and exergonic inorganic oxidation ( chemolithotrophs ) such as " Nitrosomonas europaea "; these organisms are capable of deriving energy from reduced mineral compounds like pyrites, and are active in geochemical cycling and the weathering of parent bedrock to form soil
