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Old Faithful Geyser, Yellowstone National Park

Old Faithful Geyser is the world's best known geyser. Its eruption intervals have varied from 40 to 126 minutes, averaging 92 minutes, with each eruption lasting 3-5 minutes. Geysers occur when underground constrictions increase the pressure of the water until it finally erupts.

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Uploaded on July 3, 2009
Taken on June 27, 2009