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.

Noun

rocky outermost layer of Earth or other planet.

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.

magma chamber
Noun

underground reservoir that holds molten rock.

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.