Editing Biogeochemistry (section)

==Biogeochemical cycles==
{{biogeochemical cycle sidebar}}

[[Biogeochemical cycle]]s are the pathways by which [[chemical substance]]s [[Wiktionary:cycle|cycle]] (are turned over or moved through) the [[Biotic components|biotic]] and the [[abiotic]] compartments of [[Earth]]. The biotic compartment is the [[biosphere]] and the abiotic compartments are the [[atmosphere]], [[hydrosphere]] and [[lithosphere]]. There are biogeochemical cycles for chemical elements, such as for [[calcium cycle|calcium]], [[carbon cycle|carbon]], [[hydrogen cycle|hydrogen]], [[mercury cycle|mercury]], [[nitrogen cycle|nitrogen]], [[oxygen cycle|oxygen]], [[phosphorus cycle|phosphorus]], [[selenium cycle|selenium]], [[iron cycle|iron]] and [[sulfur cycle|sulfur]], as well as molecular cycles, such as for [[water cycle|water]] and [[silica cycle|silica]]. There are also macroscopic cycles, such as the [[rock cycle]], and human-induced cycles for synthetic compounds such as [[polychlorinated biphenyl]]s (PCBs). In some cycles there are reservoirs where a substance can remain or be [[:Wiktionary:sequestered|sequestered]] for a long period of time.<ref name=Moses2012>Moses, M. (2012) [http://editors.eol.org/eoearth/wiki/biogeochemical_cycles Biogeochemical cycles] {{Webarchive|url=https://web.archive.org/web/20211122221017/https://editors.eol.org/eoearth/wiki/Biogeochemical_cycles |date=2021-11-22 }}. ''[[Encyclopedia of Earth]]''.</ref><ref>Fisher M. R. (Ed.) (2019) ''Environmental Biology'', [https://openoregon.pressbooks.pub/envirobiology/chapter/3-2-biogeochemical-cycles/ 3.2 Biogeochemical Cycles] {{Webarchive|url=https://web.archive.org/web/20210927040314/https://openoregon.pressbooks.pub/envirobiology/chapter/3-2-biogeochemical-cycles/ |date=2021-09-27 }}, OpenStax. {{Cite web |url=https://creativecommons.org/licenses/by/4.0/ |title=Creative Commons — Attribution 4.0 International — CC BY 4.0 |access-date=2022-05-20 |archive-date=2017-10-16 |archive-url=https://web.archive.org/web/20171016050101/https://creativecommons.org/licenses/by/4.0/ |url-status=bot: unknown }}.</ref><ref>[https://cnx.org/contents/ZdFkREJc@7/Biogeochemical-Cycles Biogeochemical Cycles] {{Webarchive|url=https://web.archive.org/web/20210927040316/https://cnx.org/contents/ZdFkREJc@7/Biogeochemical-Cycles |date=2021-09-27 }}, ''OpenStax'', 9 May 2019. {{Cite web |url=https://creativecommons.org/licenses/by/4.0/ |title=Creative Commons — Attribution 4.0 International — CC BY 4.0 |access-date=2022-05-20 |archive-date=2017-10-16 |archive-url=https://web.archive.org/web/20171016050101/https://creativecommons.org/licenses/by/4.0/ |url-status=bot: unknown }}.</ref>