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The mud takes the form of a viscous, often bubbling, slurry. As the boiling mud is often squirted over the brims of the mud pot, a sort of mini-volcano or "mudvolcano" starts to build up, sometimes reaching heights of 3-5 feet.
The mud is generally of white to greyish color, but is sometimes stained with reddish or pink spots from iron compounds. When the slurry is particularly colorful, the feature is then called a "paint pot".
The geothermal areas of Yellowstone National Park contain several notable examples of both mud pots and paint pots.
Hydrothermal vents