A volcano is a vent or fissure in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. [1]

23 hours ago · List & map of currently active volcanoes. Notes: The status colors of volcanoes are our subjective interpretation of activity status (unrest, alert, erupting, major eruption) and have no official …

USGS scientists monitor over 160 active and potentially active volcanoes in the United States. Some of these are erupting now and others could erupt at some point in the future. Most of these volcanoes …

Jan 8, 2026 · 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. The term volcano can also refer to the landform …

Jul 5, 2023 · Volcanoes are both the vents where molten rock material and volcanic gases are erupted from within Earth’s interior, and the cones and mountains built up around those vents. But beyond …

Jul 10, 2025 · Volcanoes are Earth’s geologic architects. They’ve created more than 80 percent of our planet’s surface, laying the foundation that has allowed life to thrive. Their explosive force crafts...

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 and ash …

Volcanoes are cracks in Earth's crust that allow molten rock and hot gases to escape. According to the U.S. Geological Survey (USGS), there are about 1,350 volcanoes worldwide that have the...

What is a Volcano? A volcano is a vent in Earth's surface where magma, gas, and ash escape. The name is also used for cones of erupted material at the vent. Volcanoes are found on many planets …

Concise daily volcanic activity summaries are published Monday through Friday and describe volcanic activity that has occurred and been reported by volcano observatories or other authoritative agencies …