Hot spring
From The Art and Popular Culture Encyclopedia
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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. In either case, the ultimate source of the heat is radioactive decay of naturally occurring radioactive elements in the Earth's mantle, the layer beneath the
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See also
- Hotspot (geology)
- Hydrothermal vents
- Earliest known life forms
- List of spa towns
- Mineral spring
- Valley of the Geysers
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