Augustine Volcano (Alaska) during its eruptive phase on January 24, 2006 A volcano is commonly defined as a vent or fissure in the crust of a planetary-mass object, such as Earth, that allows …

Nov 26, 2025 · volcano, vent in the crust of Earth or another planet or satellite, from which issue eruptions of molten rock, hot rock fragments, and hot gases. A volcanic eruption is an …

21 hours ago · Color code explanation (click to close legend) Black = (Probably) extinct Green = normal activity / dormant Yellow = unrest: some signs of unrest, but no eruption in near future …

The Global Volcanism Program (GVP) seeks better understanding of all volcanoes through documenting their eruptions during the past 12,000 years.

Jul 5, 2023 · Eruption cloud - A cloud of volcanic ash, tephra, and gases that forms downwind of an erupting volcano. Eruption column - A vertical pillar of superheated volcanic ash, tephra, …

May 21, 2025 · A volcano is an opening in a planet or moon’s crust through which molten rock, hot gases, and other materials erupt. Volcanoes often form a hill or mountain as layers of rock …

Fiery volcanoes have belched up molten rock, hot ash, and gas since Earth formed billions of years ago.

Volcano Mount St. Helens erupting on May 18, 1980 Koryaksky volcano on the Kamchatka peninsula, eastern Russia A volcano is a mountain that has lava (hot, liquid rock) coming out …

The Alaska Volcano Observatory (AVO) is a consortium of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the State of Alaska Division of …

Home » Volcanoes and Volcanic Eruptions Volcanoes and Volcanic Eruptions What is a Volcano? A volcano is a vent in Earth's surface where magma, gas, and ash escape. The name is also …