Web Search Results for "Volcanoes"

Volcanoes - National Geographic Society
20 Feb 2024 at 12:19pm
Vocabulary 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.

Volcano - Wikipedia
21 Feb 2024 at 5:18pm
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.

About Volcanoes | U.S. Geological Survey - USGS.gov
20 Feb 2024 at 3:00am
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 are located in Alaska, a state where eruptions occur almost every year.

Volcano | Definition, Types, & Facts | Britannica
20 Feb 2024 at 3:39pm
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.

Volcano facts and information - National Geographic
21 Feb 2024 at 1:19am
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...

Volcanoes 101 | National Geographic - YouTube
21 Feb 2024 at 9:18am
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 most destructive volcanic eruption...

What Is a Volcano? | NASA Space Place ? NASA Science for Kids
19 Feb 2024 at 10:28pm
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. Lava fountain at K?lauea Volcano, Hawai`i. Credit: J.D Griggs, USGS.

Forces of Nature - National Geographic Society
20 Feb 2024 at 2:42pm
Forces of Nature What is a volcano? A volcano is an opening in the Earth's surface through which lava, volcanic ash, and gases escape. Ancient people believed that volcanoes were under the control of the gods. In fact, the word volcano comes from Vulcan, the Roman god of fire.

Explainer: The volcano basics - Science News Explores
20 Feb 2024 at 9:23pm
A volcano is a spot in Earth?s crust where molten rock, volcanic ash and certain types of gases escape from an underground chamber. Magma is the name for that molten rock when it?s below ground. Scientists call it lava once that liquid rock erupts from the ground ? and may start flowing across Earth?s surface.

Plate Tectonics and Volcanic Activity
21 Feb 2024 at 6:08pm
A volcano is a feature in Earth?s crust where molten rock is squeezed out onto the Earth?s surface. This molten rock is called magma when it is beneath the surface and lava when it erupts, or flows out, from a volcano. Along with lava, volcanoes also release gases, ash, and, solid rock.

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