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Hydrothermal Mud Volcano

Mud Volcano Picture Gallery

From Andrew Alden, About.com

This small mud volcano (about 40 cm high) is of hydrothermal origin. (more below)
An example from the geyser zoneS.R. Brantley, U.S. Geological Survey photo
Acidic gases and steam rising from hot magma turns the overlying rock into soupy clay, which can bubble or spurt out of fissures on occasion. This mud volcano is in the Norris Geyser Basin in the Yellowstone region.
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