Volcanism is the eruption of molten rock, ash and gas onto the Earth's surface through vents where buoyant, gas-charged magma forces its way up from depth. Most of the roughly 1,350 potentially active volcanoes worldwide are concentrated along tectonic plate boundaries, especially the Pacific Ring of Fire, and take characteristic forms ranging from steep cinder cones built by explosive eruptions to broad shield volcanoes built from fluid lava flows.
Facts
Timescale
Timescale (category) Timescale (category) Timescale (category) Timescale (category) Timescale (category) Process Type TimescaleA single eruption can last days, months or years, while the growth of a volcanic edifice itself unfolds over thousands to millions of years. 1 Connections
Caused By
Source United States Geological Survey
Causes
Demonstrated By
An active continental rift zone with ongoing volcanic activity along its length.
Source United States Geological Survey
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Sources
1. United States Geological Survey
United States Geological SurveyPlate tectonics and people, This Dynamic Earth
As with earthquakes, volcanic activity is linked to plate-tectonic processes.
- Shaped: The Andes
- Demonstrated By: The Great Rift Valley
View the Source Volcanism (Wikipedia)
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Volcanism, vulcanism, volcanicity, or volcanic activity
View the Source Kilimanjaro (Volcano World, Oregon State University)
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Kilimanjaro is a giant stratovolcano reaching an elevation of 19,335.6 ft. (5,895 m).
View the Source Cotopaxi (Wikipedia)
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Cotopaxi is an active stratovolcano in the Andes Mountains.
View the Source Giant's Causeway (Wikipedia)
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the result of an ancient volcanic fissure eruption, part of the North Atlantic Igneous Province.
View the Source Kamchatka Peninsula (Wikipedia)
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The Kamchatka Peninsula contains the volcanoes of Kamchatka, a UNESCO World Heritage Site, that form part of the Ring of Fire.
View the Source Mesoamerica (Wikipedia)
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There are 83 inactive and active volcanoes within the Sierra Madre range, including 11 in Mexico, 37 in Guatemala, 23 in El Salvador, 25 in Nicaragua, and 3 in northwestern Costa Rica.
View the Source Pacific Northwest (Wikipedia)
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Active volcanoes in the region include Mount Garibaldi, Mount Baker, Mount Rainier, Mount St. Helens, Mount Adams, Mount Hood, Mount Meager, Mount Jefferson, Mount Shasta, Lassen Peak and Glacier Peak.
View the Source Central America (Wikipedia)
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Due to the presence of several active geologic faults and the Central America Volcanic Arc, seismic activity in the region, such as volcanic eruptions and earthquakes, is high
View the Source Sunda Strait (Wikipedia)
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The Krakatoa eruption drastically altered the topography of the strait, with as much as 18-21 km3 of ignimbrite being deposited over an area of 1.1 million km2 around the volcano.
View the Source Irrawaddy River (Wikipedia)
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Between Katha and Mandalay, the course of the river is remarkably straight, flowing almost due south, except near Kabwet, where a sheet of lava has caused the river to bend sharply westward.
View the Source Siberia (Wikipedia)
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The Siberian Traps were formed by one of the largest-known volcanic events of the last 251 million years of Earth's geological history.
View the Source Polynesia (Wikipedia)
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Most Polynesian islands and archipelagos, including the Hawaiian Islands and Samoa, are composed of volcanic islands built by hotspots (volcanoes).
View the Source Greater Antilles (Wikipedia)
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Obduction has scraped accumulated rock onto the North American plate, islands and intrusions have been formed by volcanism, and the local crust has become deformed in other ways.
View the Source Maritime Southeast Asia (Wikipedia)
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Geologically, the archipelago is one of the most active volcanic regions in the world, producing many volcanoes, especially in Java, Sumatra, and the Lesser Sunda Islands region, where most volcanoes over 3,000 m (9,800 ft) are situated.
View the Source Malay Archipelago (Wikipedia)
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Geologically, the archipelago is one of the most active volcanic regions in the world.
View the Source Afrotropical realm (Wikipedia)
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Other Indian Ocean islands, like the Comoros and Mascarene Islands, are volcanic islands that formed more recently.
View the Source Graham Land (Wikipedia)
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Graham Land's creation was volcanic and happened over 200 million years ago.
View the Source South Shetland Islands (Wikipedia)
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Various volcanoes with activity in the Quaternary exist in the islands.
View the Source Archipelago (Wikipedia)
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These are landmasses that are typically formed due to volcanic activity.
View the Source Antarctic Peninsula (Wikipedia)
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Volcanism along western Graham Land dates from the Cretaceous to present times, and outcrops are found along the Gerlache Strait, the Lemaire Channel, Argentine Islands, and Adelaide Island.
View the Source Vatnajökull (Wikipedia)
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The relationship between Vatnajökull and the volcanoes beneath it is classified as glaciovolcanism.
View the Source Bataan Peninsula (Wikipedia)
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Bataan is divided by two mountain groups of volcanic origins.
View the Source Peninsula - Wikipedia
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Peninsulas can be formed by continental drift, glacial erosion, glacial meltwater, glacial deposition, marine sediment, marine transgressions, volcanoes, divergent boundaries or river sedimentation.
View the Source Salween River (Wikipedia)
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About 1.5 million years ago, volcanic activity diverted the Salween west towards the Andaman Sea, roughly creating the modern path of the river.
View the Source Jabal al-Druze (source article)
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The Jabal al-Druze volcanic field, the southernmost in Syria
View the Source Patagonia (Wikipedia)
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volcanic eruptions have created formation of basaltic lava plateaus during the Cenozoic
View the Source Oceania (Wikipedia)
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High islands are of volcanic origin, and many contain active volcanoes
View the Source The Korean Peninsula (Wikipedia)
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many important islands in Korea were formed by volcanic activity in the Cenozoic orogeny
View the Source Java (Wikipedia)
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Java was formed by volcanic eruptions due to geologic subduction of the Australian Plate under the Sunda Plate.
View the Source Ryukyu Islands (Wikipedia)
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The larger ones are mostly volcanic islands and the smaller mostly coral.
View the Source Volcanic plateau (Wikipedia)
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A volcanic plateau is a plateau produced by volcanic activity.
View the Source Volcanic crater (Wikipedia)
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A volcanic crater is an approximately circular depression in the ground caused by volcanic activity.
View the Source Lake Van (Wikipedia)
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A volcanic eruption blocked its original outlet in prehistoric times.
View the Source Macaronesia (Wikipedia)
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Macaronesia (Portuguese: Macaronésia; Spanish: Macaronesia) is a collection of four volcanic archipelagos in the North Atlantic Ocean, off the coast of North Africa and Europe.
View the Source Cinder cone (Wikipedia)
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A cinder cone or scoria cone is a steep, conical landform of loose pyroclastic fragments, such as volcanic ash, clinkers, or scoria, that has been built around a volcanic vent.
View the Source Stratovolcano (Wikipedia)
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A stratovolcano, also known as a composite volcano, is a typically conical volcano built up by many alternating layers (strata) of hardened lava and tephra.
View the Source Plateau (Wikipedia)
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Plateaus can be formed by a number of processes, including upwelling of volcanic magma, extrusion of lava, and erosion by water and glaciers.
View the Source Mount Elbrus (Wikipedia)
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It is a dormant stratovolcano rising 5,642 m (18,510 ft) above sea level, and is the highest volcano in Eurasia, as well as the tenth-most prominent peak in the world.
View the Source Seamount (Wikipedia)
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Seamounts are typically formed from extinct volcanoes that rise abruptly and are usually found rising from the seafloor to 100-4,000 m (330-13,120 ft) in height.
View the Source Guyot (Wikipedia)
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In marine geology, a guyot (), also called a tablemount, is an isolated underwater volcanic mountain (seamount) with a flat top more than 200 m (660 ft) below the surface of the sea.
View the Source Mount Fuji (Wikipedia)
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It is the highest mountain in Japan, the second-highest volcano on any Asian island (after Mount Kerinci on the Indonesian island of Sumatra), and the seventh-highest peak of an island on Earth.
View the Source Mauna Kea (Wikipedia)
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Mauna Kea (, Hawaiian: [ˈmɐwnə ˈkɛjə]; abbreviation for Mauna a Wākea, 'White Mountain') is a dormant shield volcano on the island of Hawaiʻi.
View the Source Deccan Plateau (Wikipedia)
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The Deccan Traps in the northwest were formed by multiple layers of igneous rock deposited by basaltic lava flows following a massive volcanic eruption occurred at the end of the Cretaceous period (66 mya).
View the Source Pico de Orizaba (Wikipedia)
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Citlaltépetl (from Náhuatl citlal(in) = star, and tepētl = mountain), otherwise known as Pico de Orizaba, is an active volcano and the highest volcano in North America, as well as the highest mountain in Mexico and third highest peak in North America, after Denali of the United States and Mount Logan of Canada.
View the Source Ojos del Salado (Wikipedia)
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Nevado Ojos del Salado (Spanish pronunciation: [ˈoxos ðel saˈlaðo] ) is a dormant complex volcano in the Andes on the Argentina-Chile border.
View the Source Geyser (Wikipedia)
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Generally, geyser field sites are located near active volcanic areas, and the geyser effect is due to the proximity of magma.
View the Source Atoll (Wikipedia)
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According to Charles Darwin's subsidence model, the formation of an atoll is explained by the sinking of a volcanic island around which a coral fringing reef has formed.
View the Source Volcano - Wikipedia
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A volcano is a vent or fissure in the crust of a planetary-mass object that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface.
View the Source Fumarole (Wikipedia)
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A fumarole (; also spelled fumerole) is a vent through the surface of Earth or another terrestrial planet from which hot volcanic gases and vapors are emitted, without any accompanying liquids or solids.
View the Source Easter Island (Wikipedia)
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Easter Island is a volcanic island, consisting mainly of three extinct coalesced volcanoes
View the Source Cordillera (Wikipedia)
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Such mountain systems have a complex structure, which is usually the result of folding and faulting accompanied by volcanic activity.
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