BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY BERNHARD EDMAIER / SCIENCE PHOTO LIBRARY
Geysers. Superheated water and steam being ejected from the Pohutu (right) and Prince of Wales Feathers (left) geysers. Beneath the surface of these geysers are deep natural chambers; when they are full, the geysers erupt. The term geyser comes from the Icelandic "geysir" meaning roarer or gusher. Geysers occur in geothermal rock fissures where water in the chamber is superheated by the surrounding rocks, but is prevented from boiling by hydrostatic pressure. The water expands and spills from the cone, the pressure falls, and the superheated water suddenly boils and erupts. These geysers are at Whakarewarewa, New Zealand.
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