In what states do Volcanoes occur?
540044
Any of those along the Pacific Ring of Fire, though many are dormant: Hawaii, California, Oregon, Washington, and potentially Alaska.
25399
Indonesia has the most volcanoes, by far. It is really a special place because there seem to be volcanoes all around, in all directions. Merapi (which means "mountain of fire") erupted in January 1994 and killed a few hundred people.
669618
Yes, in fact the Pacific Ocean is surrounded by what is called The Ring of Fire, regions of intense volcanic and seismic activity. Earthquakes are generated by the collision of tectonic plates. This can cause fissure in the crust allowing the magma to rise to the surface where it collects in cavities and becomes the source for volcanoes.
426456
http://www.geology.sdsu.edu/how_volcanoes_work/subducvolc_page.html\n\nstratovolcanoes\n\nbut on land your answer is probably going to be basaltic
737671
Mt. St. Helens was formed from the subduction of the Juan de Fuca Plate underneath the North American Plate.  Subsequent eruptions, producing basalt and andesitic lava flows, have either reshaped or built up the volcano over time.
85175
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.
664494
Regional metamorphism as the name implies happens over a large area and is related to large scale tectonics such as ocean closure.  Mountain ranges are areas of regional metamorphism for example.\n\nYou would be more likely to find localised thermal metamorphism in volcanically active areas due to the influx of magma.  This would probably erase any signs of regional metamorphism in the immediate area unless the regional was very high grade.\n\nIt all depends on the type of volcano as subduction related vulcanism occurs on a wide area and may have associated regional metamorphism, where as hotspot or spreading ridge vulcanism doesn't have the compression forces.\n\nComplicated but that's Geology for you
244145
Not exactly pressure.  Tectonic plates under the Earth's crust are constantly in motion.  When they collide, mountains are formed.  These mountains become volcanoes when the tectonic plates hit each other and then move further apart, therefore creating a direct channel to the molten core of the earth.  When the molten material builds up it shoots up the hole of a volcano.
264049
There is a list here, but it also has a description of the states:\n\nhttp://geology.about.com/od/stategeologicmaps/
916333
4 ways:\n\nDivergent plate boundaries\nAt the mid-oceanic ridges, two tectonic plates diverge from one another. New oceanic crust is being formed by hot molten rock slowly cooling down and solidifying. In these places, the crust is very thin and eruptions occur frequently because of the pull by the tectonic plates. The main part of the mid-oceanic ridges are at the bottom of the ocean, and most volcanic activity is submarine. Black smokers are a typical example of this kind of volcanic activity. Where the mid-oceanic ridge comes above sea-level, volcanoes like the Hekla on Iceland are formed. Divergent plate boundaries create new seafloor and volcanic islands, such as Cjertce and Hawaii.\n\nConvergent plate boundaries\nIn places where one tectonic plate submerges beneath another, the crust melts and becomes magma. This surplus amount of magma generated in one location causes the formation of the volcano. Typical examples for this kind of volcano are the volcanoes in the Pacific Ring of Fire, and also Mount Etna and Mount Vesuvius.\n\nHotspots\nHotspots are not located on the ridges of tectonic plates, but on top of mantle plumes, where the convection of Earth's mantle creates a column of hot material that rises until it reaches the crust. The temperature of the plume causes the crust to melt and form pipes, which can vent magma. Because the tectonic plates move whereas the mantle plume remains in the same place, each volcano becomes extinct after a while and a new volcano is then being formed as the plate shifts over the hotspot. The Hawaiian Islands are thought to be formed in such a manner, as well as the Snake River Plain, with the Yellowstone Caldera being the current part of the North American plate over the hotspot.\n\nPetitspots\nIn July 2006, volcanoes were discovered that did not fit in any of the above-mentioned categories, since they are located far from the plate boundary, but are too small to be the result of a mantle plume. A new theory suggests that submergence of tectonic plates causes stress all over the plate, which causes the plate to crack in some places. However, other scientists believe the mantle plume theory to be incorrect, and consider this discovery a confirmation of their ideas.
542601
A volcano is a geological landform usually generated by the eruption through a planet's surface of magma, molten rock welling up from the planet's interior. Other forms of volcano include ice volcanoes (particularly on some moons of Jupiter, Saturn and Neptune) and mud volcanoes. On Earth, volcanoes tend to occur near the boundaries of crustal plates. Important exceptions exist in hotspot volcanoes, which occur at locations far from plate boundaries; hotspot volcanoes are also found elsewhere in the solar system, especially on its rocky planets and moons.\n \nSmoking Bromo and Semeru (background) volcanoes on Java in Indonesia.\n\nMud volcanoes are formations often not associated with known magmatic activity. Active mud volcanoes tend to involve temperatures much lower than those of igneous volcanoes, except when a mud volcano is actually a vent of an igneous volcano.\n\nThe name "volcano" is thought to derive from Vulcano, a volcanic island in the Aeolian Islands of Italy whose name in turn originates from Vulcan, the name of a god of fire in Roman mythology. The study of volcanoes is called volcanology (sometimes spelled vulcanology).\nContents [hide]\n1 Volcano classification \n1.1 Erupted material\n1.2 Shape \n1.2.1 Shield volcanoes\n1.2.2 Cinder cones\n1.2.3 Stratovolcanoes\n1.2.4 Supervolcanoes\n1.2.5 Submarine volcanoes\n1.3 Subglacial volcanoes\n1.4 Classifying volcanic activity\n2 Notable volcanoes \n2.1 Volcanoes on Earth\n2.2 Volcanoes elsewhere in the solar system\n3 Volcanology \n3.1 Volcano formation \n3.1.1 Tectonic environments of volcanoes \n3.1.1.1 Constructive plate margins\n3.1.1.2 Destructive plate margins\n3.1.1.3 Hotspots\n4 Predicting volcanic eruptions \n4.1 Seismicity\n4.2 Gas emissions\n4.3 Ground deformation\n4.4 Iceberg tremors\n4.5 Hydrology\n4.6 Remote Sensing \n4.6.1 Local Predictions\n4.6.2 Early Warning for Lahars\n4.7 Predicting future eruptions of Mt. Etna\n4.8 Monitoring of Sakurajima, Japan\n5 Effects of volcanoes\n6 Past beliefs\n7 See also \n7.1 Lists\n7.2 Types\n7.3 Specific locations\n7.4 Volcano-related phenomena\n7.5 General topics\n7.6 People\n8 References\n9 Further reading\n10 External links\n\n[edit]\n\nVolcano classification\n[edit]\n\nErupted material\n\nOne way of classifying volcanoes is by the type of material erupted (ejecta), since this affects the shape of the volcano. If the erupted magma contains a high percentage (>65%) of silica, the lava is called felsic. Felsic lavas tend to be highly viscous (not very fluid) and are erupted as domes or short, stubby flows. Viscous lavas tend to form stratovolcanoes or lava domes. Lassen Peak in California is an example of a volcano formed from felsic lava and is actually a large lava dome. This type of volcano has a tendency to explode when erupting, because the viscous lava traps volatiles (gases), which cannot escape easily. Mount Pelée on the island of Martinique is another example. Pyroclastic flows (ignimbrite) are highly hazardous products of such volcanoes, since they are composed of molten volcanic ash too heavy to go up into the atmosphere, so they hug the volcano's slopes and travel far from their vents during large eruptions. Temperatures as high as 1,200 °C are known to occur in pyroclastic flows, which will incinerate everything flammable in their path and thick layers of hot pyroclastic flow deposits can be laid down, often up to many meters thick. Alaska's Valley of Ten Thousand Smokes, formed by the eruption of Novarupta near Katmai in 1912, is an example of a thick pyroclastic flow or ignimbrite deposit.\n\nIf, on the other hand, the magma contains a relatively low percentage of silica, the lava is called mafic or basaltic and will be fluid as it erupts, capable of flowing for long distances. Mafic refers to the chemical composition of the lava—it contains higher percentages of magnesium (Mg) and iron (Fe), and correspondingly lower percentages of silica. Due to its low viscosity, v
296747
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.
860698
Earthquakes occur in every state. Almost every day there are some. Check out this:\nhttp://maps.weather.com/images/maps/special/usa_earth_720x486.jpg
439545
No, they can occur just about anywhere. They are most common in the seismically active areas, like tectonic lines, but they can also happen from other reason, like in the mountains if a piece of the rock would crumble and fall down, or if a meteor falls on earth, or if there is an underground cave or a river and it collapses... there are many reasons.
278928
Composite cone volcanoes are often found near convergent plate boundaries. And at all fault lines there are earthquakes so yes, there is.
170224
Volcanoes occur because of cracks or gaps in the Earths crust.Heat rises ,so the hot molten rock comes through the gaps and builds up.WHen the lava builds up enough to come through the last bit of crust the emense pressure makes a volocano.Explode!
703877
The "Ring of Fire" is an arc stretching from New Zealand, along the eastern edge of Asia, north across the Aleutian Islands of Alaska, and south along the coast of North and South America. It is composed over 75% of the world's active and dormant volcanoes.