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What formed Old Faithful?

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Anonymous

9y ago
Updated: 8/17/2019

Old Faithful and other geysers are formed when fractures in deep rocks allow ground water to percolate into rock that is still being heated by magma, or has not yet cooled. The water boils until the steam pressure is high enough to force a column of boiling water back up to the surface.

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Wiki User

9y ago

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