The heated ponds of Yellowstone: nature’s original steam engine.

Sure, Old Faithful was spiffy, but every ounce of its spewed hot water was the same ordinary color. Elsewhere in Yellowstone, organic and inorganic additives commingle in the waters to produce scintillating effects in multiple colors of the rainbow. Maybe not all of them, but quite a few. I wouldn’t have minded some purple, but the land wasn’t taking requests.

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