what are the different types volcanoes?
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Geologists generally group volcanoes into four main kinds--cinder cones, composite volcanoes, shield volcanoes, and lava domes.
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['Lava. Lava (molten rock) can erupt as fire fountains or lava flows (when it is runny) or as steep-sided domes (when it is viscous). ... ', 'Pyroclastic flows. ... ', 'Phreatic explosions. ... ', 'Lahars. ... ', 'Jökulhlaups. ... ', 'Landslides. ... ', 'Volcanic earthquakes. ... ', 'Tsunamis.']
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Volcanic eruptions vary widely in strength. On the one extreme there are effusive Hawaiian eruptions, which are characterized by lava fountains and fluid lava flows, which are typically not very dangerous. On the other extreme, Plinian eruptions are large, violent, and highly dangerous explosive events.
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Types of Rocks There are three basic types of rock: igneous, sedimentary, and metamorphic. Extremely common in the Earth's crust, igneous rocks are volcanic and form from molten material.
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Shield volcanoes. Shield volcanoes are found on divergent plate boundaries , where two plates move away from one another. Shield volcanoes have the following characteristics: Basaltic magma, which is high in temperature, very low on silica and with low gas content.
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['The materials associated with a volcanic eruption.', 'include lava flows (pahoehoe and aa flows for basaltic lavas), gases (primarily in the form of.', 'water vapor), and.', 'pyroclastic material (pulverized rock and lava fragments blown from.', "the volcano's vent, which include ashes, pumice.", ', blocks,', 'and bombs).']
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Most volcanoes form at the boundaries of Earth's tectonic plates. These plates are huge slabs of the Earth's crust and upper mantle, which fit together like pieces of a puzzle. These plates are not fixed, but are constantly moving at a very slow rate. They move only a few centimeters per year.
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['A volcano is formed by eruptions of lava and ash.', 'Volcanoes are usually cone shaped mountains or hills.', "When magma reaches the Earth's surface it is called lava. ... ", 'Volcanic eruptions can happen at destructive and constructive boundaries , but not at conservative boundaries or collision zones .']
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Volcanoes have distinctive features: magma chamber - this is where the molten rock is stored beneath the ground. main vent - this is the channel through which magma travels to reach the Earth's surface. secondary vent - some magma may escape through the side of the volcano, particularly if the main vent becomes blocked.
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There are three main places where volcanoes originate: Hot spots, Divergent plate boundaries (such as rifts and mid-ocean ridges), and. Convergent plate boundaries (subduction zones)
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['Tephra. Tephra is a term used to describe igneous rocks that formed during a volcanic eruption that blew molten rock into the air. ... ', 'Lava rocks. ... ', 'Volcanic ash is a type of tephra. ... ', 'Lapilli. ... ', 'Lava bombs. ... ', 'Violent volcanic eruptions.']
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There are three main types of volcano - composite or strato, shield and dome. Composite volcanoes, sometimes known as strato volcanoes, are steep sided cones formed from layers of ash and [lava] flows. ... When composite volcanoes erupt they are explosive and pose a threat to nearby life and property.
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Shield volcano eruptions are less explosive than composite volcanoes. Cinder cone volcanoes are steep, cone-shaped volcanoes built from lava fragments called 'cinders.
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Volcanic eruptions produce three types of materials: gas, lava, and fragmented debris called tephra.
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The most common way to divide lava flows into distinct types is following: Pahoehoe lava flow, Aa lava flow, Blocky lava flow, and also Pillow lava flow. Sometimes Turbulent lava flow is also added, but the latter is only of theoretical interest to scientist because we will not see that type of lava flow in the nature.
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The main parts of a volcano include the magma chamber, conduits, vents, craters and slopes.
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Real volcanoes in nature commonly fit within three basic types. Shield volcanoes, considered the least dangerous type, have low, rounded appearances caused by hot, fluid lava formation. Shield volcanoes produce mostly lava and only a little ash and coarse material. Composite cone volcanoes present a very real danger.