active volcano
Noun

volcano that has had a recorded eruption since the last glacial period, about 10,000 years ago.

Noun

bowl-shaped depression formed by a volcanic eruption or impact of a meteorite.

dormant volcano
Noun

volcano that has erupted in the past but is unlikely to erupt soon.

eruption
Noun

release of material from an opening in the Earth's crust.

fumarole
Noun

vent from which steam is emitted.

geologist
Noun

person who studies the physical formations of the Earth.

lava
Noun

molten rock, or magma, that erupts from volcanoes or fissures in the Earth's surface.

Noun

molten, or partially melted, rock beneath the Earth's surface.

sulfur
Noun

chemical element with the symbol S.

vent
Noun

crack in the Earth's crust that spews hot gases and mineral-rich water.

Noun

an opening in the Earth's crust, through which lava, ash, and gases erupt, and also the cone built by eruptions.

volcanologist
Noun

scientist who studies volcanoes.