The sulfur cycle is the collection of processes by which sulfur moves to and from minerals (including the waterways) and living systems. Such biogeochemical cycles are important in geology because they affect many minerals. Biogeochemical cycles are also important for life because sulfur is an essential element, being a constituent of many protein...
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http://en.wikipedia.org/wiki/Sulfur_cycle
circulation of sulfur in various forms through nature. Sulfur occurs in all living matter as a component of certain amino acids. It is abundant in ... [4 related articles]
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http://www.britannica.com/eb/a-z/s/183
Cyclic movement of sulfur in different chemical forms from the environment, to organisms, and then back to the environment.
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http://www.encyclo.co.uk/visitor-contributions.php
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