Geysers are jets of boiling water and steam that erupt from beneath the ground where water is heated by volcanic activity. The name geyser comes from a hot spring called Geysir at Haukadalur, Iceland. Yellowstone National Park, Wyoming, USA has more geysers than anywhere else. There are 500 active ones including Steamboat, which erupts to a height of 120 m, and Old Faithful , which erupts about every 91 minutes.
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