The term mud volcano or mud dome are used to refer to formations created by geo-excreted liquids and gases, although there are several different processes which may cause such activity. Hot water mixes with mud and surface deposits. Mud volcanoes are associated with subduction zones and about 700 have been identified. Temperatures are much cooler in these processes than found at igneous volcanoes. The largest mud volcano structures are 10 kilometres (6 mi) in diameter and reach 700 metres (2,300 ft) in height.
About 86% of the gas released from these structures is methane, with much less carbon dioxide and nitrogen emitted. Ejected materials are often a slurry of fine solids suspended in liquids which may include water, which is frequently acidic or salty, and hydrocarbon fluids.
Possible mud volcanoes have been identified on Mars.
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Famous quotes containing the words mud and/or volcano:
“The swimming hole is still in use. It has the same mudbank. It is still impossible to dress without carrying mud home in one’s inner garments. As an engineer I could devise improvements for that swimming hole. But I doubt if the decrease in mother’s grief at the homecoming of muddy boys would compensate the inherent joys of getting muddy.”
—Herbert Hoover (1874–1964)
“We are like travellers using the cinders of a volcano to roast their eggs. Whilst we see that it always stands ready to clothe what we would say, we cannot avoid the question whether the characters are not significant of themselves.”
—Ralph Waldo Emerson (1803–1882)