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 hot …

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. The term volcano can also refer to the …

Feb 25, 2025 · Discover interesting facts about volcanoes, including why and where they form and history's deadliest eruption.

Dec 23, 2025 · There are about 170 potentially active volcanoes in the U.S. The mission of the USGS Volcano Hazards Program is to enhance public safety and minimize social and economic disruption …

Get more information about volcanoes from National Geographic.

2 days ago · The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the US Geological Survey's Volcano Hazards Program.

3 days ago · Which volcanoes are erupting? - List & map of active volcanoes erupting at present

Volcanoes are some of nature's most awe-inspiring displays, with everything from exploding mountaintops to rivers of lava. Learn how all the different types of volcanoes work.

The drop down items below contain 6 descriptions of volcano types based on morphology. They were originally written for an "ask-a-volcanologist" answer. Read on for a bit more information and history …

The USGS Volcano Hazards Program enhances public safety and minimize social and economic disruption from volcanic unrest and eruption. We accomplish this by delivering effective forecasts, …