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Volcano - Wikipedia A volcano is commonly defined as 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]
Volcano | Definition, Types, Facts | Britannica 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 created by the accumulation of solidified lava and volcanic debris near the vent
About Volcanoes | U. S. Geological Survey - USGS. gov Volcanoes are openings, or vents where lava, tephra (small rocks), and steam erupt onto the Earth's surface Volcanic eruptions can last days, months, or even years What is a volcano? Redoubt volcano with minor ash eruption Photograph taken during observation and gas data collection flight by AVO staff March 30, 2009
Current Eruptions - Global Volcanism Program Overall, 47 volcanoes were in continuing eruption status as of 2 May 2025 An eruption marked as "continuing" does not always mean persistent daily activity, but indicates at least intermittent eruptive events without a break of 3 months or more
Volcano facts and information | National Geographic 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
Anatomy of a Volcano - U. S. National Park Service 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 this simple definition, volcanoes are incredibly diverse with some types being very complex
Volcanoes - Education | National Geographic Society 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 build up from repeated eruptions
What Is a Volcano? | NASA Space Place – NASA Science for Kids A volcano is an opening on the surface of a planet or moon that allows material warmer than its surroundings to escape from its interior When this material escapes, it causes an eruption