mudpot

thumb|Mudpot in Lassen Volcanic National Park thumb|Mudpots lined up above a volcanic fissure at Krafla|Hverarönd, [[Iceland]]

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