Yellowstone National Park - Don Smith Photography
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The hot water that feeds Mammoth comes from Norris Geyser Basin after traveling underground via a fault line (the limestone is the source of the calcium carbonate). Shallow circulation along this corridor allows Norris' superheated water to slightly cool before surfacing at Mammoth, generally at about 170 °F (80 °C). Algae living in the warm pools have tinted the travertine shades of brown, orange, red, and green. Mammoth Hot Springs, Yellowstone National Park, Wyoming, USA.

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