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[[Image:Deposit from hydrogen sulphide.jpg|thumb|left|300px|Deposit of sulfur on a rock, caused by volcanic gases]]
Small amounts of hydrogen sulfide occur in [[crude petroleum]] but [[natural gas]] can contain up to 90%. [[Volcano]]es and [[hot spring]]s emit some H<sub>2</sub>S, where it probably arises via the [[hydrolysis]] of sulfide minerals, i.e.
[[Sulfate-reducing bacteria]] obtain energy by [[redox|oxidizing]] organic matter or hydrogen with [[sulfate]]s, producing H<sub>2</sub>S. These microorganisms are prevalent in low-oxygen environments, such as in swamps and standing waters. [[Sulfur-reducing bacteria]] (such as [[Salmonella]]) and some [[archaea]] obtain their energy by oxidizing organic matter or hydrogen with elemental [[sulfur]], also producing H<sub>2</sub>S. Other [[Anaerobic organism|anaerobic]] bacteria liberate hydrogen sulfide when they digest sulfur-containing [[amino acid]]s, for instance during the decay of organic matter. H<sub>2</sub>S-producing bacteria also operate in the human [[colon (anatomy)|colon]], and the odor of [[flatulence]] is largely due to trace amounts of the gas. Such bacterial action in the mouth may contribute to [[bad breath]]. Evidence exists that hydrogen sulfide produced by sulfate-reducing bacteria in the colon may cause or contribute to [[ulcerative colitis]].
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A buildup of hydrogen sulfide in the atmosphere could have caused the [[Permian-Triassic extinction event]] 252 million years ago.<ref name="sciam">[http://www.sciam.com/article.cfm?articleID=00037A5D-A938-150E-A93883414B7F0000&sc=I100322 "Impact From the Deep"] in the October 2006 issue of Scientific American.</ref>
==Uses==
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