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Volcano | Definition, Types, & Facts | Britannica

https://www.britannica.com/science/volcano
Learn about volcanoes, the vents from which magma and gases erupt to the surface, and the landforms they create. Explore how volcanoes are related to plate tectonics, and see examples of different types of volcanoes and eruptions.

Volcano - Wikipedia

https://en.wikipedia.org/wiki/Volcano
Sabancaya volcano erupting, Peru in 2017 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. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and because most of Earth's plate boundaries are underwater, most volcanoes are found

Volcanoes - National Geographic Society

https://www.nationalgeographic.org/encyclopedia/volcanoes/
Learn about volcanoes, their types, eruptions, and effects on the planet and the moon. Find out how volcanoes are formed, classified, and named with examples and images.

Volcano facts and information - National Geographic

https://www.nationalgeographic.com/environment/article/volcanoes
Learn about the formation, types, dangers, and history of volcanoes on Earth. Find out how volcanoes create new land, shape landscapes, and affect climate and life.

Volcanoes 101 | National Geographic - YouTube

https://www.youtube.com/watch?v=VNGUdObDoLk
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

Volcanism | Examples, Effects, & Facts | Britannica

https://www.britannica.com/science/volcanism
Volcanism is the discharge of molten rock, fragments, or steam from the Earth's surface or interior. Learn about the types, causes, and effects of volcanism, and how it relates to plate tectonics and geologic settings.

About Volcanoes | U.S. Geological Survey - USGS.gov

https://www.usgs.gov/programs/VHP/about-volcanoes
Volcanic terrain, however, is built by the slow accumulation of erupted lava. The vent may be visible as a small bowl shaped depression at the summit of a cone or shield-shaped mountain. Through a series of cracks within and beneath the volcano, the vent connects to one or more linked storage areas of molten or partially molten rock (magma).

Volcanic eruption | Description, History, Mythology, & Facts

https://www.britannica.com/science/volcanic-eruption
Learn about volcanic eruptions, the explosive or effusive expulsion of molten rock, gases, and fragments from a volcano. Explore the causes, effects, and classifications of different types of eruptions, from Hawaiian to Plinian, and see videos and images of recent events.

Volcanism - Wikipedia

https://en.wikipedia.org/wiki/Volcanism
Volcanism, vulcanism, volcanicity, or volcanic activity is the phenomenon where solids, liquids, gases, and their mixtures erupt to the surface of a solid-surface astronomical body such as a planet or a moon. [1] It is caused by the presence of a heat source inside the body. This internal heat partially melts solid material in the body or turns

Volcanoes and Volcanic Eruptions - Facts and Information - Geology.com

https://geology.com/volcanoes/
Learn about volcanoes, their types, eruptions, hazards, and locations on Earth and other planets. Explore facts, photos, maps, videos, and articles on volcanic features and processes.

Forces of Nature - National Geographic Society

https://www.nationalgeographic.org/forces-nature/volcanoes.html
Learn what a volcano is, how it forms, and what types of volcanoes exist. Explore the anatomy, location, and eruption of volcanoes with videos, maps, and examples.

Volcanic rock - Wikipedia

https://en.wikipedia.org/wiki/Volcanic_rock
Volcanic rocks (often shortened to volcanics in scientific contexts) are rocks formed from lava erupted from a volcano. Like all rock types, the concept of volcanic rock is artificial, and in nature volcanic rocks grade into hypabyssal and metamorphic rocks and constitute an important element of some sediments and sedimentary rocks. For these

How volcanoes shaped our planet — and why we need to be ... - Nature

https://www.nature.com/articles/d41586-024-01179-1
Tamsin Mather, a volcanologist, takes readers on a journey to some of the world's most notorious and active volcanoes and explains how they work, how they have affected the climate and life on Earth, and how we should prepare for the next big eruption. The book combines geological, historical and personal stories with analogies and anecdotes.

Plate Tectonics and Volcanic Activity - National Geographic Society

https://www.nationalgeographic.org/article/plate-tectonics-volcanic-activity/
Learn how volcanoes form at the boundaries of Earth's tectonic plates, where they move apart or collide. Explore the types, shapes, and effects of volcanoes with photos, videos, and maps.

Volcano facts and types of volcanoes | Live Science

https://www.livescience.com/27295-volcanoes.html
Volcano facts and types of volcanoes. A volcano is an opening in Earth's crust where magma breaks through. A volcano on Earth is a vent or fissure in the planet's crust through which lava, ash

Smithsonian Institution - Global Volcanism Program

http://volcano.si.edu/
The Global Volcanism Program (GVP) seeks better understanding of all volcanoes through documenting their eruptions--small as well as large--during the past 12,000 years. The range of volcanic behavior is great enough, and volcano lifetimes are long enough, that we must integrate observations of contemporary activity with historical and geological records of the recent past in order to prepare

What Is a Volcano? | NASA Space Place - NASA Science for Kids

https://spaceplace.nasa.gov/volcanoes2/en/
These volcanic areas usually form mountains built from the many layers of rock, ash or other material that collect around them. Volcanoes can be active, dormant, or extinct. Active volcanoes are volcanoes that have had recent eruptions or are expected to have eruptions in the near future. Dormant volcanoes no longer produce eruptions, but might

Iceland volcano dramatically erupts again as streams of lava ... - CNN

https://www.cnn.com/2024/05/30/europe/iceland-volcano-eruption-grindavik-intl-hnk/index.html
Iceland is one of the most active volcanic areas on the planet. Rather than having a central volcano, the Reykjanes Peninsula is dominated by a rift valley, with lava fields and cones.

Volcano Erupts in Iceland, Spewing Lava 150 Feet Into the Air

https://www.nytimes.com/2024/05/29/world/europe/iceland-volcano-erupts-grindavik.html
By Egill Bjarnason. Reporting from Husavik, Iceland. May 29, 2024 Updated 6:47 p.m. ET. A volcano in southwestern Iceland erupted on Wednesday for the fifth time since December, cracking the

The build-up and triggers of volcanic eruptions - Nature

https://www.nature.com/articles/s43017-021-00174-8
Volcanic eruptions require a sufficiently large volume of magma with adequately low viscosity and density to reach the surface without totally solidifying en route 7,8,9,10,11,12,13.Additionally

Volcanic Definition & Meaning - Merriam-Webster

https://www.merriam-webster.com/dictionary/volcanic
volcanic: [adjective] of, relating to, or produced by a volcano. characterized by volcanoes. made of materials from volcanoes.

Lava spews from Iceland volcano as its fissure extends 2 miles

https://www.latimes.com/world-nation/story/2024-05-31/lava-spurts-from-iceland-volcano-for-second-day-as-its-fissure-extends-2-miles
Eruptive fissures spew lava and smoke from a volcano in Grindavik, Iceland. Volcanologist Dave McGarvie calculated that the amount of lava initially flowing from the crater could have buried the

Characteristics of volcanoes | Britannica

https://www.britannica.com/summary/volcano
volcano, Vent in the crust of the Earth from which molten rock, hot rock fragments, ash, gas, and steam issue. Most volcanoes are found on the boundaries of the enormous plates that make up the Earth's surface. Some of the most violent eruptions take place along convergent boundaries where one plate margin is forced beneath another.

Ongoing Venus Volcanic Activity Discovered With NASA's Magellan Data

https://www.nasa.gov/centers-and-facilities/jpl/ongoing-venus-volcanic-activity-discovered-with-nasas-magellan-data/
Ongoing Venus Volcanic Activity Discovered With NASA's Magellan Data. This computer-generated 3D model of Venus' surface shows the volcano Sif Mons, which is exhibiting signs of ongoing activity. Using data from NASA's Magellan mission, Italian researchers detected evidence of an eruption while the spacecraft orbited the planet in the

VOLCANIC | English meaning - Cambridge Dictionary

https://dictionary.cambridge.org/dictionary/english/volcanic
Learn the definition of volcanic as an adjective related to volcanoes or eruptions, and see how to use it in sentences. Find out the synonyms, antonyms, and translations of volcanic in different languages.

Iceland volcano erupts again, sending lava toward Grindavik - The

https://www.washingtonpost.com/world/2024/05/30/iceland-volcano-erupts-grindavik-evacuation/
Volcanic activity isn't unusual in Iceland, but the eruptions over the past few months have occurred in a zone on the Reykjanes Peninsula that hasn't been active for 800 years. Once a volcanic

Venus has more volcanism than previously known, new analysis finds

https://www.reuters.com/science/venus-has-more-volcanism-than-previously-known-new-analysis-finds-2024-05-28/
Venus has a diameter of about 7,500 miles (12,000 km), slightly smaller than Earth. The new study builds on previous findings of ongoing Venusian volcanic activity. A 2023 study found that a

Evidence of ongoing volcanic activity on Venus revealed by ... - Nature

https://www.nature.com/articles/s41550-024-02272-1
The geologically recent volcanic activity on Venus has been inferred through indirect evidence, such as variations in SO 2 or phosphine abundance in the atmosphere 1,2, surface thermal emissivity

List of the world's major volcanoes | Locations & Facts

https://www.britannica.com/topic/worlds-major-volcanoes-2226816
Learn about the most active and prominent volcanoes around the world, from Etna in the Mediterranean to Rainier in North America. Find out their elevation, first recorded eruption, and historical and cultural significance.

Iceland volcano: Concern for town of Grindavik after new eruption - BBC

https://www.bbc.com/news/articles/c844em2ey7eo
Another volcanic eruption has begun in south-west Iceland, forcing the evacuation of the famous geothermal Blue Lagoon spa and the small fishing town of Grindavik. The new fissure opened up near