Geyser

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Castle Geyser erupts water and steam, Yellowstone National Park, Wyoming.

Geysers are hot springs that episodically erupt fountains of scalding water and steam. Such eruptions occur as a consequence of groundwater being heated to its boiling temperature in a confined space (for example, a fracture or conduit). A slight decrease in pressure or an increase in temperature will cause some of the water to boil. The resulting steam forces overlying water up through the conduit and onto the ground. This loss of water further reduces pressure within the conduit system, and most of the remaining water suddenly converts to steam and erupts at the surface.

The most significant area for geysers in the United States of America is Yellowstone National Park, with the best known being Old Faithful.

Sources

USGS Photo Glossary

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