What reason for creation of VOLCANIC on mountains during which they explode and produces lots of heat?
552370
Volcano is the result of Lava and gases gushing out of the surface of the earth at great heat and pressure.  The molten lava is running over the land and destroy the plants and trees and after cooling becomes rock there. Fresh lava  comes out and run in the available slope.  The result is a mountain is growing with fire and lava.  Thus the mountains are the result of volcano and lava.  When the pressure within the volcano is reduced the volcano takes rest.It will erupt at any time  and send lava and gases, fire in all the directions.  The centre of the earth is believed to contain very hot lava and gases which is likely to come out at any time in any part; and most likely in the soft surfaces .
74311
An explosive eruption is a volcanic term to describe a violent, explosive type of eruption. Mount St. Helens in 1980 was a good example of an explosive eruption. Such an eruption is driven by gas including water vapour accumulating under great pressure. Driven by the hot rising magma as it interacts with the ground water the pressure increases until it bursts violently through the overmantle of rock. This is merely the beginning. In many cases the rising magma will have vast quantities of gas dispersed through it, partially dissolved; held only by the enormous pressure. With the sudden release of pressure following the initial explosion this gas resumes its gaseous form, violently and explosively. This secondary explosion is often far more violent than the first one; the rocks, dust, gas and pyroclastic material may be blown 20 km into the atmosphere at rate of up to 100 000 tonnes per second, travelling at several hundred metres per second.\n\nSooner or later this cloud collapses, almost as violently, creating a Nuée ardente, the killer cloud of hot volcanic dust.
1063053
Earthquakes, epic centers, rumbles they all have the same meanings they come from two plat tectonics forcing one under the other. Either creating mountains are large crevice in the ground. In some cases earthquakes can trigger volcanic activate, but not always eruptions.
86122
I was taught in school that it is due to radioactive decay of elements in the core.  That is pure bullcrap.  If it were true, every time a volcano exploded, there would be radioactive toxins spread out across the world.  Others say gravity pushing on the substances create heat and liquification of earth.  This may be somewhat true.  If you put a piece of solid ice in a chamber and put extreme pressure on it, it turns to liquid.  There must be some other source of internal heat generation though.  I have never found a satisfactory answer to date.  I really don't think anyone knows, just like gravity is still a big mystery.
286236
A huge eruption, in common terms, can mean an explosive volcano.  And that is caused when magma that is about to exit at the opening begins to cool down and causes the hole to close/block (not leaving enough space for the magma to flow).  This causes hot gas to be trapped until it builds up so much that it explodes.  Such volcanoes include ashes, "volcano bombs", dust, cinder, etc etc\n\nHowever, any type of eruption (be it explosive or just a quiet flow) is caused by movement in the plates. Plates are the result of "continental drift".  When one plate goes under another plate, the plate becomes extremely hot and liquifies.  This "liquid" then builds up, and because it is in excess... it finds a hole though which it can flow.  So the amount is determined by the magnitude of the earthquake and how much of the plate has melted.
833924
I think volcanic exhalatives formed from molten material rocks under great heat and pressure.
705501
Composite volcanoes typically form along subduction zones (ocean - continent plate boundaries).  They tend to have higher viscosity magma (andesite and dacite) which allows for more gas pressure to develop.  This produces more explosive eruptions.\n\nSome examples of subduction zones are the western coast of the USA and South America.  The Cascades and the Andes were and are currently being formed by subduction related processes.
435645
A, because it's the division between two tectonic plates. the plates move apart and magma from inside the earth comes up and piles up in the form of mountains.
71801
It depends on the volcano.\n\nIf magma - molten rock - is erupted it forms new formations when it cools. On the big island of Hawaii, the volcanic eruptions have added a lot of new land to the island.\n\nIf it is a pyroclastic flow - fast, hot gasses and volcanic debris -  like the one that destroyed Pompeii or Mt. St. Helens, there may not be any new land created and the existing land will be radically altered.\n\nIn general, when a land based volcano erupts, the lava and stone and ash build up around the eruption site into a cone shape.\n\nUndersea volcanos spweing lava also build up, but not in a cone shape. Once the hot rock hits water it starts to cool into large pillow-shaped forms.
280371
well I don't know how old it is but I'm pretty sure they formed from two tectonics plates crashing in a convergent matter causing reverse faults\n\nin other words two land plate crashed and all that pressure made the mountains
1067036
There is a lot of thermal energy that could be utilized with a volcano.  The problem is that Volcano's are unpredictable and could ruin any type of plumbing that you tried to set up to capture the heat.
1098939
Lava or pumice which is formed in a volcanic eruptions has air pockets in it. If smothed on one or two sides it could be used to cool dinner.
871525
A stratovolcano is a tall, conical volcano composed of many layers of hardened lava, tephra, and volcanic ash. These volcanoes are characterized by a steep profile and periodic, explosive eruptions. The lava that flows from them is highly viscous, and cools and hardens before spreading very far. The source magma of this rock is classified as acidic, or high in silica to intermediate (rhyolite, dacite, or andesite. or basalt). This is in contrast to less viscous basic magma that forms shield volcanoes (such as Mauna Loa in Hawaii), which have a wide base and more gently sloping profile. Many stratovolcanoes exceed a height of 2500 m.\n\nStratovolcanoes are a by-product of the subduction of tectonic plates. The source melts of these volcanoes arise as a result of the dewatering of oceanic crust at specific pressure/temperature conditions as the plate subducts to lower depths. The water freed from the subducting slab allows partial melting of the overlying mantle rock, which rises due to its lower density relative to the surrounding mantle rock, and pools at the base of the crust. The melt is initially basic in composition. As it rises through the crust, it incorporates more acidic adjacent crustal rock, leading to a final intermediate composition. The water remains in the melt and upon eruption contributes to the explosive power of these volcanoes as superheated steam.\n\nAlthough stratovolcanoes are sometimes called composite volcanoes, volcanologists prefer to use the term stratovolcano to distinguish among volcanoes because all volcanoes of any size have a composite (layered) structure — that is, are built up from sequential outpourings of eruptive materials.
716046
When lava (melted rock) is extruded onto the surface of the Earth, it forms new igneous rock. Lava doesn't last long on the Earth's surface before it cools. \n\nIs your question actually concerning the oldest igneous rocks?
305467
It has to do with the amoungt of silica (SiO2) present in the magma.  Andesitic magma is very viscous, and very explosive, which is a function of the amount of silica.  The greater the percentage of silica, the more viscous the magma is.  With higher levels of silica present, and always high amounts of hydrogen, the possibility to create water under extreme conditions (eruption) has a greater potential with the Andesitic magma because of the greater supply of silica.  The greater supply of silica is linked to subduction zones because a large part of the melt is continental crust which is much higher in silica than oceanic crust.\n\nSo, the concentration of water is low in Basaltic Magma because the concentration of silica is also low.  That is also why Basaltic Lava flows instead of exploding.
50910
Like most of the interior of the earth, the movements and dynamics of magma are poorly understood. However, it is known that an eruption usually follows movement of magma upwards into the solid layer (the earth's crust) beneath a volcano and occupying a magma chamber. Eventually, magma in the chamber is forced upwards and flows out across the planet surface as lava, or the rising magma can heat water in the surrounding landform and cause explosive discharges of steam; either this or escaping gases from the magma can produce forceful ejections of rocks, cinders, volcanic glass, and/or volcanic ash also known as tephra. While always displaying powerful forces, eruptions can vary from effusive to extremely explosive.\n\nMost volcanoes on the land are formed at destructive plate margins: where oceanic crust is forced below the continental crust because oceanic crust is denser than continental crust. As the oceanic crust 'subducts', it is forced into a higher-temperature region called the asthenosphere, and melts. Friction between these moving plates may also be a cause of melting. The reduced density of the melting rock forces the newly formed magma to rise. As the magma rises through weak areas in the continental crust it may eventually erupt as one or more volcanoes. For example, Mount St. Helens is found inland from the margin between the oceanic Juan de Fuca Plate and the continental North American Plate. The oceanic crust is normally a highly-'mafic' (iron and magnesium rich) rock, but as it rises through granitic (more silicic) continental plates, it may cause 'partial melting' of both mantle rocks and the plate rocks, producing magmas of varying silicity. Volcanic arcs forming near subduction zones, on the edges of continental plates, usually form high-silicity (high-viscosity) stratovolcanoes. Examples include the South American Andes and the Cascade range.\n \nA volcano generally presents itself to the imagination as a mountain sending forth from its summit great clouds of smoke with vast sheets of flame. The truth is that a volcano seldom emits either smoke or flame, although various combinations of hydrogen, carbon, oxygen, and sulfur do sometimes ignite. What is mistaken for smoke consists of vast volumes of fine dust (called volcanic ash), mingled with steam and other vapors, chiefly sulfurous. Most of what appears to be flames is the glare from the erupting materials, glowing because of their high temperature; this glare reflects off the clouds of dust and steam, resembling fire.\n\nPerhaps the most conspicuous part of a volcano is the crater, a basin of a roughly circular shape, formed by a vent (or vents) from which magma erupts as gases, lava, and ejecta. A crater can be of large dimensions, and sometimes of vast depth. Very large features of this sort are termed calderas. Some volcanoes consist of a crater alone, with scarcely any mountain at all; but in the majority of cases the crater is situated on top of a mountain (the volcano), which can tower to an enormous height. Volcanoes that terminate in a principal crater are usually of a conical form.\n\nVolcanic cones are usually smaller features composed of loose ash and cinder, with occasional masses of stone which have been tossed violently into the air by the eruptive forces (and are thus called ejecta). Within the crater of a volcano there may be numerous cones from which vapours are continually issuing, with occasional volleys of ashes and stones. In some volcanoes these cones form lower down the mountain, along rift zones or fractures. When the cone is eroded these rifts or lava filled fractures remain as radial near vertical dikes of volcanic rock. For example the radiating dikes at Shiprock in NW New Mexico.
305725
Yes, the seismic activity that causes one can also cause the other.  When the Earth's techtonic plates shift but experience some resistance, they shake, jump, rattle the area around that resistance.  Sometimes a crack in the Earth's crust is created or widened which creates the eventual environment for a volcano.  Othertimes volcanoes are created over a hot spot (thin crust) in the Earth's crust, like the Hawaiian islands.  This is somewhat different, although some tremors can be felt.