each volcano is made of 95% of lava erupted during which phase?
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A volcanic event can include\n\n(1) an eruptive pulse (essentially an explosion with an eruption plume, but also non-explosive surges of lava. A pulse may last a few seconds to minutes, \n\n(2) an eruptive phase that may last a few hours to days and consist of numerous eruptive pulses that may alternate between explosions and lava surges, and\n\n(3) a single eruption or eruptive episode, composed of several phases, that may last a few days, months or years (Fisher and Schmincke, 1984). Paricutin, Mexico was in eruption for nine years. Stromboli, Italy has been in eruption for over 2000 years.
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Because of the volcanoes.
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There are three types of lava and lava flows: pillow, pahoehoe, and aa. Pillow lavas are volumetrically the most abundant type because they are erupted at ocean ridges and because they make up the submarine portion of seamounts and large intraplate volcanoes, like the Hawaii-Emperor seamount chain. Pahoehoe is the second most abundant type of lava flow.\n\nEruptions under water or ice make pillow lava. Pillow lavas have elongate, interconnected flow lobes that are elliptical or circular in cross-section. \n\n"Pahoehoe" and "aa" are Hawaiian words that describe lava. Pahoehoe lava is characterized by a smooth, billowy, or ropy surface. Pahoehoe flows tend to be relatively thin, from a few inches to a few feet thick. In map-view the flows tend to be narrow and elongate. \n\n    Aa is characterized by a rough, jagged, spinose, and generally clinkery surface. Aa lava flows tend to be relatively thick compared to pahoehoe flows. During the early episodes of the current eruption of Kilauea volcano, aa flows up to 36 feet (11 m) thick surged through the Royal Gardens subdivision at rates as great as 108 ft/min (33 m/min). Pictures in Hawaiian Tour Guide illustrate many of the points noted above.\n\nAll volcanic eruptions produce lava. The lava can take one of two forms: lava flows or pyroclastics. We already described lava flows. Pyroclastics are pieces of lava explosively thrown out of a volcano by the expansion of gas bubbles. Pyroclasts can take many forms depending on the violence of the eruption, type of eruption, and composition of magma/lava. Two types of pyroclasts that I'm sure you are familiar with are ash and cinders. Ash is produced by very violent eruptions that fragment the lava into pieces smaller than 2 mm (0.08 inch). An excellent example of an ash producing eruption is the May 18, 1980, eruption of Mount St. Helens. Cinders are pieces of fragmented lava in the size range of 2-64 mm (0.08-2.56 inches). A good example of an eruption that produced a cinder cone is Paricutin in central Mexico.\n\nLava and pyroclasts have a variety of uses including building or ornamental stone and road material. Volcanic rocks also make an excellent substrate for agriculture.
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Check out all the links I listed, you should enjoy...\n\nA volcano is an opening (or rupture) in the Earth's surface or crust, which allows hot, usually molten rock, ash, and gases to escape from deep below the surface. Volcanic activity involving the extrusion of rock tends to form mountains or features like mountains over a period of time.\n\nVolcanoes are generally found where two to three tectonic plates pull apart or are coming together. A mid-oceanic ridge, like the Mid-Atlantic Ridge, has examples of volcanoes caused by "divergent tectonic plates" pulling apart; the Pacific Ring of Fire has examples of volcanoes caused by "convergent tectonic plates" coming together. By contrast, volcanoes are usually not created where two tectonic plates slide past one another (like the San Andreas fault). Volcanoes can also form where there is stretching of the Earth's crust and where the crust grows thin (called "non-hotspot intraplate volcanism"), such as in the African Rift Valley or the European Rhine Graben with its Eifel volcanoes).\n\nFinally, volcanoes can be caused by "mantle plumes," so-called "hotspots;" these hotspots can occur far from plate boundaries, such as the Hawaiian Islands. Interestingly, hotspot volcanoes are also found elsewhere in the solar system, especially on rocky planets and moons.
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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.
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A subset of the map at the following web page?\n\nhttp://www.mapsofworld.com/major-volcanoes.htm
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Hi,\n\nChirripo is not a volcano. The Talamanca Mountainrange where Chirripo lies was formed in the inferior Pleiocene due to the pressure excerted by the Cocos Plate.\n\nC
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Pressure release of molten lava, such as a volcanic eruption.
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the activity, located between the aleutian islands and southern japan, is importent in huge ways. you know how the earth contains a lot of pressure? well, the ring of fire acts as a waste basket because the earth gets rid of the pressure by using the volcanos. another importent thing is the magma. the magma, combined with water, metals, rock and heat, are used to create islands.
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http://en.wikipedia.org/wiki/Volcanos
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You're asking how hot is lava at the time of eruption - it all depends on the composition of the magma that was the source of the lava. A general guide would be:\n\nmafic magma - about 1100 Celcius\nintermediate magma - about 1000 Celcius\nfelsic magma - about 800 Celcius
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according to my source it is a volcanic remnant being... um, harvested (for lack of a better word) for lava rock.  Just a note, most active or recently (in geological history, not ours) active volcanos can be told by thier names, generally being called Mount ______, instead of ________ Mountain.  try it :)
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Magma is the molten rock when it is under the surface.  It becomes lava when it reaches the surface.\n\nThe tremendous pressures in the Earth's mantle heat rock and liquify it.
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Volcanic activity can be classified as \na)active b)intermittent c)dormant or d)extinct. \n\nActive volcanoes erupt constantly. The eruption is generally quiet,but occasionally becomes violent. A famous active volcano is Stromboli,which lies on an island off the coast of Italy.\n\nIntermittent volcanoes erupt at fairly regular periods. Such volcanoes include Mount Asama in Japan, Mount Etna in Sicily, and Hawaii's Hualalai.\n\nDormant volcanoes have become inactive, but not long enough to know whether they will erupt again. Such 'sleeping' volcanoes include Lassen Peak in California and Paricutin in Mexico.\n\nExtinct volcanoes have been inactive since the beginning of recorded history. Aconcagua in Argentina and Mount Kenya in Kenya are extinct volcanoes. They propably will not erupt again.
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According to geological observations, Mount Pinatubo's activity started about 1,1 million years ago. In this early times, it seems that the volcano was less active than the modern Pinatubo.\nThe biggest volcanic eruption of the Pinatubo, and probably of the human history, was the explosion that occurred 35000 years ago. The total volume of material erupted was up to 25 cubic kilometres.\nLater large eruptions occurred 17000, 9000, 5500 and 3900–2300 and 500 years ago, the total volume of material ejected each time was about 10 cubic km. \nThe 1991 eruption was preceded by a 500 years of dormant period, during that the mountain was completely covered by the rainforest.
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1. epicenter\n2. fault\n3.lava\n4.pumice\n5.rope
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Below are the most active volcanoes in order of how long that have been active.\nEtna Italy 3500 years \nStromboli Italy 2000 years \nYasur Vanuatu 800 years \nAmbrym Vanuatu 1935- \nTinakula Solomon Islands 1951?- \nErta Ale Ethiopia 1967- \nManam Papua New Guinea 1974- \nLangila Papua New Guinea 1960- \nBagana Papua New Guinea 1972- \nSemeru Indonesia 1967- \nMerapi Indonesia 1967- \nDukono Indonesia 1933- \nSakura-jima Japan 1955- \nSuwanose-jima Japan 1949- \nSanta Maria Guatemala 1922- \nPacaya Guatemala 1965- \nArenal Costa Rica 1968- \nSangay Ecuador 1934- \nErebus Antarctica 1972- \nPiton de la Fournaise Reunion 1920- \nKilauea Hawaii 1983- \n\nThe following 4 volcanoes emit the most lava. \nKilauea (Hawaii) \nMt Etna (Italy) \nPiton de la Fournaise, (Réunion) \nNyamuragira, (D.R. Congo) \n\nThis website also looks to have a lot of information on the most active volcanoes in the world. It breaks them down by continent.\nhttp://www.volcanodiscovery.com/volcano-tours/558.html