What causes hot springs?



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    Hot springs are one of a group of geological occurences, including geysers and fumaroles, that feature geothermically heated water escaping to the Earth’s surface.  The water’s temperature increases either by contact with magma in volcanic areas or by percolating deep enough under the Earth’s crust to increase temperature.  When the water is so hot that is has turned completely to steam by the time it breaks the Earth’s crust, it is known as a fumarole.  When the water erupts with force from the Earth’s crust and forms a tower of water, it is known as a geyser.  Hot springs are a toned-down version, where geothermically heated water ‘springs’ from the Earth’s surface with minimal force.

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