Volcanism - Wikipedia
WebVolcanism, 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. It is caused by the presence of a heat source inside the body.
Volcano - Wikipedia
WebA 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.
Volcanology - Wikipedia
WebVolcanology (also spelled vulcanology) is the study of volcanoes, lava, magma and related geological, geophysical and geochemical phenomena ( volcanism ). The term volcanology is derived from the Latin word vulcan. Vulcan was the ancient Roman god of fire.
Timeline of volcanism on Earth - Wikipedia
WebThis timeline of volcanism on Earth includes a list of major volcanic eruptions of approximately at least magnitude 6 on the Volcanic explosivity index (VEI) or equivalent sulfur dioxide emission during the Quaternary period (from 2.58 Mya to the present). Other volcanic eruptions are also listed.
Volcanism - Simple English Wikipedia, the free encyclopedia
WebVolcanism. Three types of plate boundary. Volcanism (or vulcan activity) is the eruption of magma onto the surface of the Earth. Magma under the crust is under very great pressure. When folding and faulting occur, cracks or fractures appear. These are lines of weakness.
Volcanic rock - Wikipedia
WebVolcanic 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.
Types of volcanic eruptions - Wikipedia
WebThere are three main types of volcanic eruption: Magmatic eruptions are the most well-observed type of eruption. They involve the decompression of gas within magma that propels it forward. Phreatic eruptions are driven by the superheating of steam due to the close proximity of magma.
Volcano - Simple English Wikipedia, the free encyclopedia
WebA volcano is a mountain that has lava (hot, liquid rock) coming out from a magma chamber under the ground, or did have in the past. Volcanoes [1] are formed by the movement of tectonic plates . The Earth's crust has 17 major, rigid tectonic plates. These float on a hotter, softer layer in its mantle. [2]
Volcanism | Examples, Effects, & Facts | Britannica
WebMay 9, 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. The majority of active terrestrial volcanoes and related phenomena occur where two tectonic plates meet.
Global Volcanism Program - Wikipedia
WebThe Smithsonian Institution's Global Volcanism Program (GVP) documents Earth's volcanoes and their eruptive history over the past 10,000 years. The mission of the GVP is to document, understand, and disseminate information about global volcanic activity.
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