Volcanoes

thumb|upright=1.35|Augustine Volcano (Alaska) during its eruptive phase on January 24, 2006

underwater vents or fissures in the Earth's surface from which magma can erupt

cloud of ash and tephra released during an explosive volcanic eruption

area of the Earth's crust prone to localized volcanic activity

highest volcanoes of the seven continents

volcanic landform which resembles a true volcanic crater, but differs in that it is not an actual vent from which lava has erupted

Type of hill, mountain, or volcano

thumb|Herðubreið, a tuya in Iceland A tuya is a flat-topped, steep-sided volcano formed when lava erupts through a thick glacier or ice sheet. They are rare worldwide, being confined to regions which were covered by glaciers and had active volcanism during the same period.

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cave formed in volcanic rock, especially one formed via volcanic processes

volcanologic calculation

unique identifier for a volcano or related feature

floating mass of pumice in the ocean