Volcanoes of South America
Villarrica, is one of only five volcanoes worldwide known to have an active lava lake inside its crater. The volcano usually generates strombolian eruptions, with ejection of fiery pyroclasts and lava flows. Melting of snow and glacier ice as well as rainfalls often cause massive lahars (mud and debris flows), such as during the eruptions of 1964 and 1971.