Wikipedia The sulphur cycle is the collection of processes by which sulphur moves between rocks, waterways and living systems. Such biogeochemical cycles are important in geology because they affect many minerals. Biochemical cycles are also important for life because sulphur is an essential element, being a constituent of many proteins and cofactors, and sulphur compounds can be used as oxidants or reductants in microbial respiration. The global sulphur cycle involves the transformations of sulphur species through different oxidation states, which play an important role in both geological and biological processes.

https://en.wikipedia.org/wiki/Sulfur_cycle 

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