which magma is most associated with composite volcanoes
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COMPOSITE VOLCANOES COMPOSITE VOLCANOES. Composite volcanoes are constructed from multiple eruptions, sometimes recurring over hundreds of thousands of years, sometimes over a few hundred. Andesite magma, the most common but not the only magma type forming composite cones, produces lava more brittle than basaltic lava because of its higher viscosity. Although andesitic composite cones are constructed dominantly of fragmental debris, some of the magma intrudes the cones as dike or sills.
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- Composite volcanoes are most often associated with convergent plate  boundaries, specifically subduction zone, but some have been noted  at divergent boundaries and hot spot … s.
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Composite volcanoes Composite volcanoes (also called stratovolcanoes) are much more explosive than shield volcanoes, the other important type of volcano.The large and generally cone-shaped volcanoes form along plate boundaries called subduction zones where one of the Earth's plates moves below another.omposite volcano magma contains more silica, SiO 2, than that of a shield volcano and is therefore stickier (more viscous).
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Viscosity of Magmas Viscosity of Magmas. The nature of volcanic eruptions is highly dependent on magma viscosity and also on dissolved gas content. Silicate-rich magmas are typically formed at destructive plate boundaries, by partial melting and/or assimilation of crustal rocks (which are richer in silica than the rock of the mantle).
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- Both andesite and basalt are volcanic rocks. Basalt is denser and  generally darker than andesite. It has a lower silica content and  more iron and magnesium. It most often … forms from pahoehoe or a'a  lava flows and occasionally scoria cinders.ost  supervolcanoes are fed by rhyolitic magma.   Andesitic magma is in between basaltic and rhyolitic magma, with a  moderate amount of silica. It has an intermediate density, cooling  point, and viscosity compared with other types of magma.
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Types of Volcanoes Composite volcanoes are steep-sided volcanoes composed of many layers of volcanic rocks, usually made from high-viscosity (thick like honey) lava, ash and rock debris (broken pieces). Mt. Rainier (right), Mount St. Helens and Mt. Shasta in California are examples of this type of volcano.
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Composite Volcanoes Composite Volcanoes. By David Olmstead. Composite volcanoes are also called strato-volcanoes. It is a member of the volcanic landforms family. As the name suggests, they are composed of lava flows and pyroclastic materials of intermediate composition which includes volcanic ash, cinders, blocks and fragments. of rock.It should not be confused with shield volcanoes or cinder cones because they not only differ in composition but also the shapes.ormation of composite volcanoes. They result from alternating layers of the composite materials like lava volcanic ash. A significant characteristic of the composite volcano is the process through which the magma from inside the earth’s surface transits to the top of the land.
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- Composite volcanoes most often are found near subduction zones.  They can be found at either oceanic-oceanic convergent plate  boundaries, oceanic-continental plate boundari … es, or  continental-continental plate boundaries. They are especially  prevalent in the Pacific Ring of Fire.omposite volcanoes most often are found near subduction zones.  They can be found at either oceanic-oceanic convergent plate  boundaries, oceanic-continental plate boundari … es, or  continental-continental plate boundaries. They are especially  prevalent in the Pacific Ring of Fire.
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-  It is less dense, more viscous, and cooler than most other types of  magma. It usually has a very high gas content, meaning that most  eruptions involving it will be highly explosive. Most  supervolcanoes are fed by rhyolitic magma.It is less dense, more viscous, and cooler than most other types of  magma. It usually has a very high gas content, meaning that most  eruptions involving it will be highly explosive. Most  supervolcanoes are fed by rhyolitic magma.
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- 1 Composite volcanoes are made up of alternating layers of lava and ash (other volcanoes just consist of lava). 2  They are usually found at destructive [destructive boundaries: The boundary of two plates which are moving towards each other.
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Types of Volcanoes: Shield, Cinder Cones & Composite Cones Composite Cone Volcanoes. Composite cone volcanoes, which are also called 'stratovolcanoes' or simply 'composite volcanoes,' are cone-shaped volcanoes composed of layers of lava, ash and rock debris. Composite cone volcanoes are grand sites and can grow to heights of 8,000 feet or more.
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Types of Volcanoes: Shield, Cinder Cones & Composite Cones Composite volcanoes can rise over 8000 feet. A simple cross section through a composite volcano. When composite volcanoes erupt they are explosive and pose a threat to nearby life and property. Eruptions are explosive due to the thick, highly viscous lava that is produced by composite cone volcanoes. This viscous lava has a lot to do with why they are shaped the way they are. The thick lava cannot travel far down the slope of the volcano before it cools.
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What are the characteristics of a volcano? Composite volcanoes, sometimes called stratovolcanoes, are typically deep-sided, symmetrical cones of large dimension built of alternating layers of lava flows, volcanic ash, cinders, blocks, and bombs and may rise as much as 8,000 ft above their bases.
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Stratovolcano The magma forming this lava is often felsic, having high-to-intermediate levels of silica (as in rhyolite, dacite, or andesite), with lesser amounts of less-viscous mafic magma. Extensive felsic lava flows are uncommon, but have travelled as far as 15 km (9.3 mi).Stratovolcanoes are sometimes called composite volcanoes because of their composite layered structure built up from sequential outpourings of eruptive materials.They are among the most common types of volcanoes, in contrast to the less common shield volcanoes.t has been essentially dormant since then. A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice, and volcanic ash.
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Volcanic pipe They are considered to be a type of diatreme. Volcanic pipes are composed of a deep, narrow cone of solidified magma (described as carrot-shaped), and are usually largely composed of one of two characteristic rock types — kimberlite or lamproite.These rocks reflect the composition of the volcanoes' deep magma sources, where the Earth is rich in magnesium.olcanic pipes are composed of a deep, narrow cone of solidified magma (described as carrot-shaped), and are usually largely composed of one of two characteristic rock types — kimberlite or lamproite. These rocks reflect the composition of the volcanoes' deep magma sources, where the Earth is rich in magnesium.
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- Stratovolcanoes (also called Composite Volcanoes) 1  Have steeper slopes than shield volcanoes, with slopes of 6 to 10o low on the flanks to 30o near the top.  The steep slope near the summit is due partly to thick, short viscous lava flows that do not travel far down slope from the vent.
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- Let's review. Volcanoes are vents in the earth's crust through which lava, rock fragments, hot vapor and gases are ejected. There are different types of volcanoes based on their size, shape, composition and eruptive style.Composite cone volcanoes are cone-shaped volcanoes composed of layers of lava, ash and rock debris.inder cone volcanoes are steep, cone-shaped volcanoes built from lava fragments called 'cinders.' These volcanic cinders, also known as ' scoria ,' are glassy volcanic fragments that explode from the volcano and cool quickly, building up the sides of the cinder cone volcano fairly quickly.
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Types of Volcanoes Strato Volcanoes comprise the largest percentage (~60%) of the Earth's individual volcanoes and most are characterized by eruptions of andesite and dacite-lavas that are cooler and more viscous than basalt.
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Science Ideas 6:42 AM By Christy Ocariza, In cinder cone, composite, mayon volcano, mt. fuji, paracutin, shield, Volcano. Try to look at this mnemonics: There are three major types of volcanoes: the composite volcano, the cinder cone volcano, and the shield volcano.Among these three types of volcanoes, the composite volcano is the famous one because it is what we usually see in the movies.The cinder cone is the simplest one and the shield volcano is the largest among the three. The composite volcano is cone shaped volcano with a branched vent and a primary vent in the center.mong these three types of volcanoes, the composite volcano is the famous one because it is what we usually see in the movies. The cinder cone is the simplest one and the shield volcano is the largest among the three.
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- Basaltic magma is the main product of partial melting at depth in the mantle below the ocean basins. Andesite is the common magma type of island and continental margin volcanic arcs, and rhyolite is an important magma of the continental lithosphere.
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Composite Volcano Stratovolcanoes are typically composed of layers of pyroclastic material. The layers that form the mountain are lava, volcanic ash, tephra, and pumice. Andesite, dacite and rhyolite lavas erupted by these volcanoes have a high percentage of quartz and feldspar minerals.
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Pillow lava Pillow lavas are commonly of basaltic composition, although pillows formed of komatiite, picrite, boninite, basaltic andesite, andesite or even dacite are known. In general the more intermediate the composition, the larger the pillows, due to the increase in viscosity of the erupting lava.
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Krakatoa A composite volcano, such as Krakatoa, is formed when runny lava escapes through a fissure in the earths crust and spreads out . This occurence happens everytime the volcano erupts creating layers of cooled lava and ash. These types of volcanos are typicaly tall and have steep sides.
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Composite Volcano Andesite, dacite and rhyolite lavas are the primary types of lava that form these volcanoes. Eruptions on the volcanoes often alternate between tephra and lava flows. Subduction zone volcanoes. Geologists often use the term stratovolcanoes to describe the mountains that form in subduction zones.