What types of volcanic rock are generally found at convergent plate boundaries?
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Answer two is right in that it would be igneous (all volcanic rocks are igneous).  What is normally seen at a convergent boundary is an igneous rock that is Andesitic (Andesite).  This is produced from lava that has a relatively high level of silica.  These rocks were initially identified on the slopes of the Andes Mountains (that's why its called Andesite) due to the portion of the pacific plat that is subducting under South America.
45660
Three types of rocks: igneous (formed by volcanic activity, like obsidian and pummice), metamorphic (formed by heat and pressure, like marble and quartzite) and sedementary (formed by accumulated depositing of loose material, packed hard into a rock, like sandstone and limestone).
123818
The three types of plate boundaries are: convergent (or destructive, two plates push against one another), divergent (or constructive, two plates move away from each other), and transform (two plates slide past one another)
782941
http://pubs.usgs.gov/gip/volc/types.html\nThe website above takes you to USGS pub called: \nPrincipal Types of Volcanoes.\n\nIt will help you answer your  question.
728798
The website below will take you to a well-illustrated USGS pub on plate tectonics. It is called: This Dynamic Earth--the story of plate tectonics. By Kious and Tilling.\nBecause it is a government publication, it isn't copyrighted, but you should give appropriate credit if you reuse the figures, etc.\n\nVolcanoes are not randomly distributed over the Earth's surface. Most are concentrated on the edges of continents, along island chains, or beneath the sea forming long mountain ranges. More than half of the world's active volcanoes above sea level encircle the Pacific Ocean to form the circum-Pacific "Ring of Fire." In the past 25 years, scientists have developed a theory -- called plate tectonics -- that explains the locations of volcanoes and their relationship to other large-scale geologic features.-From: Brantley, 1994, Volcanoes of the United States: USGS General Interest Publication.   \nThe ring of fire is associated with convergent plate boundaries.
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divergent margins = depressurization melting\nconvergent margins = subduction-related partial melting of the overlying mantle wedge through the loss of volatils form the downgoing slab
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Igneous rocks-- formed from magma, extrusive or intrusive.  extrusive have small crystal forms ex. basalt, scoria, pumice.  Intrusive large crystals forms ex. granite, gabbro\n\nSedimentary rocks -- the only rocks that contain fossils, formed at the surface, formed from fragments of other things ie. rocks, fossils, woody plants (coal), or minerals crystallizing out of water (limestone) -- Are porous found in aquifers, oil fields.\n\nMetamorphic rocks -- forms from alteration of other rock with increased pressure and/or temperature.  Always in a solid state (they don't melt)called recrystallization, form new minerals that are stable at increased temperature and/or pressure, happens below the earth's surface (at depth).
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These are all related to the crusts. \n\nA divergent boundary occurs when two Earth tectonic plates move away from each other, causing a depression or a range. \n\nSubduction occurs underwater when seawater tectonic plates converge into continental plates. Since seawater tectonic plates are more dense than continental plates, it 'subduct's and goes under. \n\nThere's more than 3 types of magma, depending on its temperature, density, and composition.\n\nAs you know, the plate tectonics theory says that the Earth's crust is moving constantly. By applying the observations of divergent boundaries through time (ex, Great Rift Valley created over centuries), that will -support- and -clarify- the plate tectonics theory. So, divergent boundaries being observed serves as evidence and support for the theory.\n\nSubduction occurs in sea-floor spreading, which explains why crusts closer to the mid-atlantic ridge are "warmer" and "younger", while the ones further away, and most likely closer to a subduction zone is colder. This shows that the Earth's crust is once again moving, once again indicating that the theory is true. \n\nMagma is formed when divergent boundaries move away from each other, and is replaced by new crusts formed by magma. The cycle of sea-floor spreading undergoing subduction, sinking under the continental crust, melting into magma, then re-forming  at the Mid-Atlantic ridge.
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There's no such thing as a volcanic plate.\n\nTechtonic plates "float" on the earth's mantle, and most of the earths volcanism occurs where those plates meet.  The motion of these plates is mostly driven by convection currents in the mantle and is beyond the scope of this post.
278928
Composite cone volcanoes are often found near convergent plate boundaries. And at all fault lines there are earthquakes so yes, there is.
730338
Definitely continental to continental convergence. When continental crust meets continental crust neither will be subducted so they press together under extreme pressure over large amounts of time which leads to deformation of the crust (folding & faulting). This is one of several ways that mountains can be produced. AKA orogenesis.
840305
The plate which is being subducted under the other plate carries down volatiles with it (carbon dioxide, water etc from in the clay and sediments and rocks and stuff) - and these volatiles allow melting to occur in the mantle at a lower temperature than it would ordinarily do. Some of this melt (magma) may then rise up through the overlying crust (so on the overriding plate, not the one which is being pushed under) and erupt out at the surface as lava... so forming volcanoes.
58331
Igneous rocks are formed with heat. They are most commonly found around volcanoes. Metamorphic rocks are formed with heat and pressure. Sedimentary rocks, like sandstone and limestone, are formed by pressure.
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The outermost part of the Earth's interior is made up of two layers: above is the lithosphere, comprising the crust and the rigid uppermost part of the mantle. Below the lithosphere lies the asthenosphere, which is a more viscous zone of the mantle. Although solid, the asthenosphere has very low shear strength and can flow like a liquid on geological time scales. The deeper mantle below the asthenosphere is more rigid again.\n\nThe lithosphere essentially floats on the asthenosphere. The lithosphere has broken up into what are called tectonic plates—in the case of Earth, there are ten major and many minor plates. These plates move in relation to one another at one of three types of plate boundaries: convergent, divergent, and transform. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along plate boundaries. The lateral movement of the plates is typically at speeds of several centimetres per year.
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Plates collide in areas called subduction zones.  At these zones, oceanic crust is subducted underneath continental crust due to its higher density.  Subduction results in great amounts of heat and pressure building up in the zone.  When these factors become strong enough, they are forced to the Earth's surface in the form of volcanoes.  That is why volcanoes typically occur along plate boundaries (e.g., the ring of fire).  However, volcanoes are not exclusive to plate boundaries.  They can also form over hot spots within the interior of the Earth.  The islands of Hawaii are an example.  The islands are formed on the Pacific Plate.  The plate is moving in a northwest direction, while the hot spot underneath the crust is stationary.  As the plate moves over the hot spot, volcanic eruptions occur.  The result is a new island being created.  The islands are actually the products of a series of shield volcanoes that grow in age as one moves to the northwest.
678919
hhhmmmm....must be igneous...um...olivine. thats what it says. Pyroxene and plagioclase are also common
233251
Those would be the Eurasian and Australian plates:\n\nhttp://www.cotf.edu/ete/modules/msese/earthsysflr/plates1.html\n\nTambora was affected by the subduction of the Australian plate under the Eurasian in the same way subduction affects most plate-boundary volcanoes; by the partial melting of the the descending plate, which created magma that ultimately fed the volcano.