Geysers are an impressive combination of natural oddities. Like hot springs, they lie over areas of hot groundwater. The difference with geysers is, the water's exit to the surface is constricted, keeping it from circulating and creating intense pressure, which results in fantastic eruptions.
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Water underneath a geyser can exceed the temperature at which water would boil at the surface (199°F/93°C). It's under so much pressure, however, that boiling is largely prevented. Some pockets of the water boil, creating turbulence, letting off steam, and causing small amounts of overflow to come out of the geyser. Actions like these can eventually release enough pressure to allow for sudden boiling so hot that much of the water turns to steam. This steam then forces water out of the vent, causing violent eruptions. Once the water cools or little is left in the reservoir, the cycle begins again.
Yellowstone National Park contains more geysers than anywhere else in the world. It's home to Old Faithful, the world's most famous geyser, and Steamboat, the world's largest geyser, where eruptions have reached 300 to 400 feet.
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Read more about geysers:
Yellowstone National Park: Geysers
American Ground Water Trust: Geysers - How They Work