Waterfalls

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Excelsior-Geyser-Runnoff-67882.jpg
Excelsior Geyser Spring  produces 4000 gallons of boiling water per minute which flows from the pool to the Firehole River down this little waterfall as well as a few other boiling streams nearby just out of the frame. The yellow and orange color comes from microorganisms known as thermophiles, meaning heat loving bacteria.