Old Faithful Photograph by Science Photo Library

Old Faithful

by Science Photo Library

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Title

Old Faithful

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Science Photo Library

Medium

Photograph - Photograph

Description

Old Faithful. View of steam rising from the world's most famous geyser, Old Faithful. Geysers (Icelandic geysir" = gusher) consist of deep wells in geothermal rock fissures. Somewhere near the base of the well is a large chamber. The water in the chamber is heated by the surrounding rocks until it is well over normal boiling point, but is prevented from boiling by hydrostatic pressure. The heating also causes the water to expand, spilling from the lip of the well. At a critical point, the loss of water allows the hydrostatic pressure to fall to a point where the superheated water boils spontaneously and erupts. Old Faithful is in Yellowstone National Park, USA."

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September 17th, 2018

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