Spring produced by the emergence of geothermally heated groundwater
"Hot springs" redirects here. For other uses, see Hot Springs (disambiguation).
Grand Prismatic Spring and Midway Geyser Basin in Yellowstone National Park
A hot spring, hydrothermal spring, or geothermal spring is a spring produced by the emergence of geothermally heated groundwater onto the surface of the Earth. The groundwater is heated either by shallow bodies of magma (molten rock) or by circulation through faults to hot rock deep in the Earth's crust.
Hot spring water often contains large amounts of dissolved minerals. The chemistry of hot springs ranges from acid sulfate springs with a pH as low as 0.8, to alkaline chloride springs saturated with silica, to bicarbonate springs saturated with carbon dioxide and carbonate minerals. Some springs also contain abundant dissolved iron. The minerals brought to the surface in hot springs often feed communities of extremophiles, microorganisms adapted to extreme conditions, and it is possible that life on Earth had its origin in hot springs.[1][2]
Humans have made use of hot springs for bathing, relaxation, or medical therapy for thousands of years. However, some are hot enough that immersion can be harmful, leading to scalding and, potentially, death.[3]
^Farmer, J.D. (2000). "Hydrothermal systems: doorways to early biosphere evolution" (PDF). GSA Today. 10 (7): 1–9. Retrieved 25 June 2021.
^Des Marais, David J.; Walter, Malcolm R. (2019-12-01). "Terrestrial Hot Spring Systems: Introduction". Astrobiology. 19 (12): 1419–1432. Bibcode:2019AsBio..19.1419D. doi:10.1089/ast.2018.1976. PMC 6918855. PMID 31424278.
^"Hot Springs/Geothermal Features - Geology (U.S. National Park Service)". www.nps.gov. Retrieved 2021-02-11.
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