Grotto Geyser Photos

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Grotto Geyser erupts about every eight hours. The interval between eruptions is longer after a longer eruption. The eruptions are about 10 feet (3.0 m) high and can last from about 1 hour to more than 10 hours long, although there have been eruptions that lasted more than 26 hours.
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Grotto Geyser - Yellowstone - USA