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metal prints yellowstone national park metal prints old faithful metal prints geyser metal prints geothermal activity metal prints yellowstone metal prints

photographs yellowstone national park photos old faithful photos geyser photos geothermal activity photos yellowstone photos

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Old Faithful. View of the world's most famous geyser, Old Faithful, erupting in winter. 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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