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 …

Jan 7, 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 …

Principal Types of Volcanoes Geologists generally group volcanoes into four main kinds--cinder cones, composite volcanoes, shield volcanoes, and lava domes. Cinder cones C inder cones …

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 …

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

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

Get more information about volcanoes from National Geographic.

5 days ago · Interactive Map of Active Volcanoes and recent Earthquakes world-wide

Not all of Colorado’s volcanic activity is rooted in the area’s natural history. At least one volcano in the state is considered to be active.

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.