Mud volcano or mud dome refers to formations created by geo-exuded slurries (usually including 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 produce no lava. The earth continuously exudes a mud-like substance, which may sometimes be referred to as a “mud volcano”.
A place where mud volcanoes can be found in Europe are the Berca Mud Volcanoes near Berca in Buzău County, Romania, close to the Carpathian Mountains.
The Berca Mud Volcanoes are a geological and botanical reservation located in the Berca commune in the Buzău County in Romania. Its most spectacular feature is the mud volcanoes, small volcano-shaped structures typically a few metres high caused by the eruption of mud and natural gases.
-I made this – original photos –

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