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Science and Space
Main Health and Human Body Earth Space Prehistoric World A-Z

Mammoth Hot Springs

Born of frozen thermal steam, a frosty fairyland glazes the world of Mammoth Hot Springs in Yellowstone National Park. Deposits of a white mineral, travertine, were created by Yellowstone's volcanic plumbing—a hot spot active for two million years. That heat feeds some 300 geysers, the greatest concentration on Earth.

Photograph by Michael Quinton, Minden Pictures