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The geysers in Yellowstone and other areas of geothermal activity occur as rainwater is heated by underground magma. One thing about all liquids including water is that boiling point depends on pressure, the higher the pressure, the hotter it has to get in order to boil. In a geyser the water is heated until a small mount boils off from the top. This lowers pressure on the water below it, lowering the boiling point, and resulting in rapid boiling which causes the hot water and steam to fountain.

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12y ago

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