what are the names of the different types of volcanoes?
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Principal Types of Volcanoes. Geologists generally group volcanoes into four main kinds--cinder cones, composite volcanoes, shield volcanoes, and lava domes.
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How many volcanoes are in Alaska? The Alaska Peninsula and the Aleutian Islands have about 80 major volcanic centers that consist of one or more volcanoes. Our website has an interactive map of Alaska's volcanoes. Learn more: USGS Alaska Volcano Observatory.
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['Igneous rock.', 'Pumice.', 'Basalt.', 'Perlite.', 'Rhyolite.', 'Obsidian.', 'Trachyte.', 'Phonolite.']
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Volcanoes are most common in these geologically active boundaries. The two types of plate boundaries that are most likely to produce volcanic activity are divergent plate boundaries and convergent plate boundaries. At a divergent boundary, tectonic plates move apart from one another.
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As volcanoes erupt, they build up layers of lava that may eventually break the water's surface. When the tops of the volcanoes appear above the water, an island is formed. While the volcano is still beneath the ocean surface, it is called a seamount. Oceanic islands can form from different types of volcanoes.
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Sometimes, the plates collide with one another or move apart. Volcanoes are most common in these geologically active boundaries. The two types of plate boundaries that are most likely to produce volcanic activity are divergent plate boundaries and convergent plate boundaries.
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The high temperatures and pressure under Earth's crust keep magma in its fluid state. There are three basic types of magma: basaltic, andesitic, and rhyolitic, each of which has a different mineral composition. All types of magma have a significant percentage of silicon dioxide.
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Volcanism occurs regularly at two of the three types of plate Boundaries. The most volcanism occurs at diverging plate boundary where plates separate. Volcanoes also form at converging plate boundaries where one plate dives beneath the other at subduction zones.
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Italy has three main active volcanoes: Etna on Sicily, Vesuvius near Naples and Stromboli, which shares the name of the small Sicilian island. Stromboli is one of the most active volcanoes on the planet, according to Geology.com, and has almost been erupting continuously since 1932.
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['The materials associated with a volcanic eruption.', 'include lava flows (pahoehoe and aa flows for basaltic lavas), gases (primarily in the form of.', 'water vapor), and.', 'pyroclastic material (pulverized rock and lava fragments blown from.', "the volcano's vent, which include ashes, pumice.", ', blocks,', 'and bombs).']
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['Upper mantle. Lithospheric mantle. Subcontinental lithospheric mantle. Oceanic lithospheric mantle.', 'Lower mantle.']
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Volcanoes are classified by the eruption type and by the volcanic cone shape. ... The three cone shapes are cinder cones, shield cones, and composite cones or stratovolcanoes. The six eruption types are in order from least explosive to the most explosive; Icelandic, Hawaiian, Strombolian , Vulcanian , Pelean, and Plinian.
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Volcanic eruptions pull materials up from deep within the earth to form various volcanic landforms, such as lava domes, lava plateaus, fissure eruptions, craters and calderas. Learn about these volcanic landforms and how they are created.
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The Big Island, for instance, is constructed of 5 major volcanoes: Kilauea, Mauna Loa, Mauna Kea, Hualalai and Kohala. Mauna Loa is the largest active volcano on Earth. Kilauea is presently one of the most productive volcanoes on Earth (in terms of how much lava it erupts each year).
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['A volcano is formed by eruptions of lava and ash.', 'Volcanoes are usually cone shaped mountains or hills.', "When magma reaches the Earth's surface it is called lava. ... ", 'Volcanic eruptions can happen at destructive and constructive boundaries , but not at conservative boundaries or collision zones .']
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Lavas, particularly basaltic ones, come in two primary types: pahoehoe (pronounced 'paw-hoey-hoey") and aa (pronounced "ah-ah"). Both names, like a number of volcanological terms, are of Hawaiian origin. A third type, pillow lava, forms during submarine eruptions.
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When magma erupts at the surface it can form different types of volcanoes depending on the viscosity, or stickiness, of the magma, the amount of gas in the magma, and the way in which the magma reached the surface. Different types of volcanoes include stratovolcanoes, shield, fissure vents, spatter cones and calderas.