Cryovolcano

A cryovolcano is a type of volcano that erupts gases and volatile material such as liquid water, ammonia and hydrocarbons rather than molten rock. The erupted material, collectively called cryolava, originates from a subsurface reservoir of cryomagma; cryovolcanic eruptions can take many forms, from fissure and curtain eruptions to effusive cryolava flows and large-scale resurfacing, and the cryolava freezes quickly after eruption, building and altering surface features.