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This diagram shows the geothermal plumbing system beneath Geyser Flat at Whakarewarewa. A column of hot water rises to the surface, erupting through a number of vents. The geysers (Prince of Wales Feathers and Pōhutu) have narrow vents, which allow pressure and temperature to build up until the water starts to erupt explosively.
Te whakamahi i tēnei tūemi
Te Ara - The Encyclopedia of New Zealand
Source: GNS Science
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