Pohutu geyser at Whakarewarewa, New Zealand

Pohutu geyser at Whakarewarewa, New Zealand

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Credit: SIMON FRASER/SCIENCE PHOTO LIBRARY

Caption: Pohutu geyser. Superheated water and steam being ejected from Pohutu geyser. This geyser gushes water to a height of 20-30 metres, erupting at least once per hour. Beneath the surface cone is a deep natural chamber; when this is full the geyser erupts. 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, spills from the cone, and as the pressure falls the superheated water suddenly boils and erupts. Pohutu geyser is at Whakarewarewa, New Zealand.

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Keywords: geothermal activity, geyser, new zealand, pohutu, pohutu geyser, steam from geyser, whakarewarewa

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