Claim: Tardigrades can live in high temperatures.

The geothermal phenomena known as `` mud volcanoes '' are often not true mud volcanoes -LRB- pelovolcano -RRB- . See mudpot for further information .  A mud volcano or mud dome is a landform created by the eruption of mud or slurries , water and gases . There are several geological processes that may cause the formation of mud volcanoes . Mud volcanoes are not true igneous volcanoes as they do not produce lava and are not necessarily driven by magmatic activity . The Earth continuously exudes a mud-like substance , which may sometimes be referred to as a `` mud volcano '' . Mud volcanoes may range in size from merely 1 or 2 meters high and 1 or 2 meters wide , to 700 meters high and 10 kilometers wide . Smaller mud exudations are sometimes referred to as mud-pots . The largest -LRB- man made -RRB- mud volcano is `` Lusi '' in Java , Indonesia , which is 10 km in diameter .   The mud produced by mud volcanoes is most typically formed as hot water , which has been heated deep below the earth 's surface , begins to mix and blend with subterranean mineral deposits , thus creating the mud slurry exudate . This material is then forced upwards through a geological fault or fissure due to local subterranean pressure imbalances . Mud volcanoes are associated with subduction zones and about 1100 have been identified on or near land . The temperature of any given active mud volcano generally remains fairly steady and is much lower than the typical temperatures found in igneous volcanoes . Mud volcano temperatures can range from near 100 C to occasionally 2 C , some being used as popular `` mud baths . ''   About 86 % of the gas released from these structures is methane , with much less carbon dioxide and nitrogen emitted . Ejected materials are most often a slurry of fine solids suspended in water that may contain a mixture of salts , acids and various hydrocarbons .   Possible mud volcanoes have been identified on Mars .