Lava will be spraying the higher, that is, will form a larger outbreak. Liquidity indicators of magma, magma viscosity mainly by magma in silica (Si) content (from fifty to seventy) and temperature level to decide. The more silicon dioxide or temperature, the lower, more viscous magma, the lower the liquidity. Also the amount of ejecta more faster, the affected area .
Will follow to increase.Magma and liquid less volatile components: continued outflow of lava flows, but less likely to explode. Example: Hawaii’s Mauna LoaMagma liquid and more volatile components: lava flow emitted at high angles, like the fountain general. Example: Mt Mihara in Japan (Izu Oshima)Magma flow is low and less volatile components: no explosions, lava flows can not flow too .
Far and the accumulation of volcanic dome (or lava dome). Example: Japan’s Showa New MountainMagma volatile components of low mobility and more: an explosive eruption.For example, the basalt magma composition containing silica less volatile component is relatively small and high temperature, viscosity small. Therefore, a large turnover of basaltic magma, its eruptions are relatively quiet, mostly overflow magma, forming large .

Material) accumulated in the crater formed in the hills. Most of Cinder cone are corrosion resistance, because the rain fell on cone penetration to the water permeability of volcanic slag, the less of their surface erosion. Loose pyroclastic materials as cement, it can not form a high accumulation, usually less than 500 meters.Other terrainCaldera (Caldera): caldera is usually due to .
Volcanic cone at the top (or a group of volcanic cone) due to collapse to lose the support of underground lava formation. Shape for the bowl-shaped depressions, the number of meters to several kilometers in diameter range. A famous example is Yellowstone National Park, Yellowstone caldera duplex. The English name for the Spanish language source Caldera, meaning pot or large .
Pot.MaarMaar (maar): is an explosion of magma and water interact to form. Deep under the surface to form a circle surrounding the crater, and was surrounded by a low elastic ring. Often formed by volcanic lake water. The etymology for the Latin mare, the “sea.” See Maar.Lava plateau:, or lava plateau, usually by liquid magma infiltration by a large number .

Of cracks formed.Volcanic eruption is: under the volcano from the ground through a channel, the gas, debris, or the process of magma erupted to the surface. Usually includes three stages: the formation and initial magma rising into the magma (magma storage locations) and the eruption.The length of the volcanic eruptionSome volcanologists believe that a volcanic eruption can be divided into:Eruption .
Pulse: a few seconds to a few minutes of eruptionEruption stages: the first pulse has a strong eruption caused the eruption of several pulseEruption: eruption phases from a few months, duration from a few days to a few yearsThe Smithsonian Institution (The Smithsonian Institute) another sub-method, based on each period of rest between the two eruptions define a full eruption. .
If the interval between two eruptions more than three months, then the two belong to two different eruption to eruption.Factors affectingMagma composition and fluidityType of volcanic eruption, magma emitted by the mobility and the amount of volatile components effects are quite different. The amount of volatile components will affect the strength of magma eruption. The more volatile components, ash and .

Seems like a shield. Such volcanic basalt magma is usually composed of high mobility, it can be distributed in large area to form a broad Yamagata. The most famous example is the Hawaiian Islands, this archipelago of each island is a huge shield volcano.Volcanic domeVolcanic domeMain Entry: volcanic domeVolcanic dome (lava dome, or known as the lava dome), common in .
Volcanic crater or on the flank, is a dome-shaped protrusions, it seems like some of the plants, bulbs. Volcanic dome is made of high viscosity of the lava formation, due to its high viscosity, can not flow away from the crater, the volcano and near the cooling solidification. Volcanic dome Qiuhui Cheng Long, this is because the underground magma chamber .
Space can not accommodate all of magma, causing part of the magma dome below to squeeze into. If the growing dome is located on steep slopes, the focus of its growth may lead to instability, leading to landslides, or volcanic debris flows.Cinder coneMain article: Cinder coneCinder Cone (Cinder cone) is the residue from the igneous or volcanic dust (ejected volcanic .

Of several volcanic groups are distributed.Edit this paragraph Back to the top of the structure of volcanic ejecta volcanic magma openings in the stacked cone formed hills, known as the volcanic cone. Cone may form a small volcanic cone, its access to the main volcanic cone is connected through the channel without a separate magma source, called parasitic cones. The .
Top of the funnel-shaped depression (the original magma vents) called the crater. Magma erupted to the surface of the channel, known as volcanic pipes, which condensation when the channel is blocked magma, called volcanic neck.Compound volcano (Stratovolcano, also known as layered volcano), its appearance more as a beautiful, symmetrical cone. They are continuously accumulated by numerous lava flows formed. The .
Lava of this volcano high viscosity, typically andesite. Beautiful symmetry of its appearance, more than a tourist attraction. Many famous mountains fall into this category, such as: Mount Fuji in Japan, Taiwan, also possesses, the Philippines, Mayon Volcano, Italy, Vesuvius, Stromboli and other volcanoes.Shield volcanoShield volcanoMain article: Shield volcanoShield volcanoes (Shield Volcano) to ease the slope with a broad, overall .

Of about 80,000 km, approximately as W-shaped distribution. However, the distribution of volcanic ridges, uneven, concentrated in the Mid-Atlantic ridge, there are now more than 60. Pacific and Indian Ocean mid-ocean ridge volcano was relatively small. Mid-ocean ridge volcanic dominated by submarine volcanoes, there are small volcanic islands (eg: the Seychelles)Great Rift Valley volcanic belt: the Great Rift Valley is .
The crustal movement by the formation of the African Plate, geologists predict millions of years, the East Africa may be splitting into two different sections, geological activity has remained frequent. The better known examples are: Mount Kilimanjaro in Kenya, the Democratic Republic of Congo Mount Nyiragongo, etc.Mediterranean Himalayan volcanic belt: West from the Pyrenees before, up the Himalayas, the total .
Length of about 100,000 km, but unevenly distributed. Many parts of Europe distribution in Italy, such as Vesuvius, Mount Etna and so on. The Aegean Sea islands are also a number of volcanic islands, of which Santorini explosion occurred in prehistory. The middle of almost no volcano. Parts of Asia, the Indian-Australian Plate and the Eurasian plate at the junction .

The “plume” cause. As the plates move in the hot spot to do the level, there was a series of volcanic formation. This role in succession, will cause a series of volcanic island group, while farther away from the volcanic hot spots of its older generation’s Vietnam.The distribution of volcanicUnder the influence of volcanoes around the world, mostly in blocks .
Of volcanic junction, but there are still some exceptions (hot spots). The main volcanic zone, including:Circum-Pacific volcanic belt (also called Ring of Fire): From the east coast of South America, Andes Pacific coast, through Central America, Mexico, U.S., Canada to Alaska, the Aleutian Islands and along the Kamchatka peninsula to the Pacific flower color Islands West Bank, including the Kuril .
Islands, Japan, the Ryukyu Islands, Taiwan and its outlying islands, the Philippine Islands, then connect Indonesia, Papua New Guinea, Solomon Islands, as of New Zealand. The volcanic belt of volcanoes around the world, accounting for almost 75, and the activities are quite frequent.Mid-ocean ridge volcanoes: including the Pacific, Atlantic and Indian Ocean mid-ocean ridge three oceans, with a total length .

Convection. When the plates push each other with relatively high density side to the other side of the bottom will fall, called subduction, and subduction occurred in the band area known as the subduction zone or convergent plate junction. Underground subduction plate heat will melt, forming magma. Slowly by the buoyancy of magma rising through the last gathering as magma, .
That is, volcanic magma storage areas at the bottom. When the gas pressure in the magma build up a level, volcanoes erupted. For example: the Pacific Rim volcanoes, mostly for such a volcano. Distribution of some volcanic rifting of the plate junction, that is, separate the two plates ribbon area. In this region, hot mantle material to rise, the formation .
Of submarine volcanic mountains, known as mid-ocean ridges.Hot volcanic island chain of mobileSome volcanoes are not located in the junction block, for example, double Yellowstone caldera and the Hawaiian Islands. Volcanologist said the volcano is located in the “hot spot” on. Current hot spot mechanisms are not yet clear, scientists generally agree that the bottom of hot mantle rising from .

High-temperature deep underground volcanic magma and related gases, debris ejected from the Earth’s crust formed, with a special type of geological structure. Volcanic eruption is a very serious natural disasters, it is often accompanied by earthquakes. Can be divided into extinct volcanoes and active volcanoes, over time, there is no volcanic eruption of the volcano called sleep (dormant volcano). In .
Addition there is a mud volcano, it is not, strictly speaking science volcano, but many of the public also see it as a type of volcano. Volcanic eruption would cause harm human beings, but it also brings many benefits. Many precious stones are formed due to volcanic eruptions; volcanic eruptions can also expand the land area of the Hawaiian Islands .
Is formed by a volcanic eruption; some of the volcano could become a scenic spot, and promoting tourism, such as Japan’s Mount Fuji.Specializing in the subject of volcanic activity known as volcanology.Plate at the junction of the causes of volcanoesSee plate, earthquakes, mid-ocean ridges, hot spotsPlate tectonics theory holds that plate movement is the result of earth asthenosphere caused thermal .