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Old Faithful geyser in Yellowstone NP begins its eruption with a plume of super-heated water spewing up to 185 feet into the...
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Old Faithful

Yellowstone NP

Old Faithful geyser in Yellowstone NP begins its eruption with a plume of super-heated water spewing up to 185 feet into the cloudy sky. The geyser's frequency of eruption is every 82 minutes with each eruption lasting from 1.6 to 5.1 minutes. Photo © copyright by Robert Faucher.

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