About Volcanoes | U.S. Geological Survey - USGS.gov
About Volcanoes. By Volcano Hazards Program. 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.
Volcano - Wikipedia
A volcano is a rupture 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. The process that forms volcanoes is called volcanism.
Volcano facts and information - National Geographic
Jan 15, 2018 · 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...
Volcano facts | National Geographic Kids
1. Put simply, a volcano is an opening in the Earth’s surface. Usually found in a mountain, the opening allows gas, hot magma and ash to escape from beneath the Earth’s crust. 2. The word “volcano” comes from the Roman name “Vulcan”. “But who was Vulcan?” you might ask. He was the Roman god of fire! Love animals? You’d love our magazine!
Volcanoes 101 | National Geographic - YouTube
Jan 14, 2020 · About 1,500 active volcanoes can be found around the world. Learn about the major types of volcanoes, the geological process behind eruptions, and where the ...
Volcano | Definition, Types, & Facts | Britannica
Oct 29, 2024 · 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.
What Is a Volcano? | NASA Space Place – NASA Science for Kids
Oct 11, 2024 · 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.
Volcanoes and Volcanic Eruptions - Facts and Information - Geology.com
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 and moons in our solar system.
Volcanoes - Education | National Geographic Society
Oct 19, 2023 · 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. Volcanoes are classified as active, dormant, or extinct.
Volcanism | Examples, Effects, & Facts | Britannica
Oct 22, 2024 · Volcanism, any of various processes and phenomena associated with the surficial discharge of molten rock, pyroclastic fragments, or hot water and steam, including volcanoes, geysers, and fumaroles.