Geysers erupting in a geothermal area. These geysers are the Prince of Wales' Feather geyser (left) and Pohutu geyser (centre),in the geothermal area of Whakarewarewa,near Rotorua,on New Zealand's North Island. A geyser is a deep natural well in a geothermal rock fissure. The water is heated by surrounding rocks until it is well over its normal boiling point. The pressure prevents it boiling until a critical temperature when the superheated water boils and erupts upwards. The Pohutu getser can erupt to a height of 30 metres,and usually erupts every hour | |
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Crédit: | Science Photo Library / Alean, Dr. Juerg |
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