Most of the Earth's crust has volcanic origin. Volcanoes erupt, and form mountains and other land forms. Also, the gaseous vapors that come from volcanoes formed the atmosphere.
75% of the world's dormant and active volcanoes are situated in the Ring of Fire.
The name volcano came from Vulcan, the Roman god of fire.
Volcano eruptions can trigger earthquakes, tsunamis, flash floods and mud flows.
There is a volcano in Indonesia that erupts electric blue lava.
80% of volcanic eruptions occur underwater.