Definition: Mudpots, Mud Pools, or Mud Volcanoes

From Open Energy Information

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Mudpots, Mud Pools, or Mud Volcanoes

A kind of hot spring or fumarole with limited water causing a bubbling pool with a consistency of mud or clay.

Wikipedia Definition

A mudpot, or mud pool, is a sort of acidic hot spring, or fumarole, with limited water. It usually takes the form of a pool of bubbling mud. The acid and microorganisms decompose surrounding rock into clay and mud.