mud volcano

noun
a vent in the earth's surface through which escaping gas and vapor issue, causing mud to boil and occasionally to overflow, forming a conical mound around the vent.

Origin:
1810–20

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mud volcano
 
n
a cone-shaped mound formed from fine mud ejected, with gases and water, from hot springs, geysers, etc, in volcanic regions

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

mud volcano

mound of mud heaved up through overlying sediments. The craters are usually shallow and may intermittently erupt mud. These eruptions continuously rebuild the cones, which are eroded relatively easily.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Earthquakes, deformation, and large mud volcano eruptions.
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