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Boiling mud pots at Yellowstone National Park

Credit: photographer unknown
article: Geothermal Features of Yellowstone National Park 		Other images from this article
Geyser at Yellowstone National Park Boiling mud pots at Yellowstone National Park Thermal Pool at Yellowstone National Park Mammoth Hot Springs at Yellowstone National Park
Boiling mud pots at Yellowstone National Park, photographer unknown