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Steaming Mud Volcano at Yellowstone National Park in winter
hot spring; hot; water; Mud Volcano; Yellowstone; National Park; winter; Wyoming; travel; tourism; tourist attraction; turbulent; noisy; cavern; mouth; hydrogen sulfide; carbon dioxide; steam; heat; spring; rust; red; rock; wave; bubble; geothermal; snow; mud; volcano; iron sulfides; thermophiles
All Images copyright © 2002-2018 Reimar Gaertner
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