Old Faithful in Yellowstone National Park erupts 

Old Faithful in Yellowstone National Park erupts every 90 minutes +/- 10 minutes with an average of 130-140 feet. During an eruption, Old Faithful expels 3,700-8,400 gallons of boiling water and last 1.5-5 minutes. The one I saw was 2.5 minutes. It was definately a cool display.
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www.nps.gov/ye...