what are the 4 types of volcanic eruptions?
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['Hydrothermal eruption. An eruption driven by the heat in a hydrothermal systems. ... ', 'Phreatic eruption. An eruption driven by the heat from magma interacting with water. ... ', 'Phreatomagmatic eruption. ... ', 'Lava. ... ', 'Strombolian and Hawaiian eruptions. ... ', 'Vulcanian eruptions. ... ', 'Subplinian and Plinian eruptions.']
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['interrupt.', 'abruption.', 'incorrupt.', 'irruptive.', 'rupturing.', 'uncorrupt.', 'eruptions.', 'eruptives.']
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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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The steep-walled caldera contains Lake Toba, the largest volcanic lake on the planet. Erupting at least 2800 km3 of magma in a single event 74,000 years ago, it ranks as the largest volcanic eruption of the Quaternary geologic period, qualifying as an 8.8 magnitude eruption.
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Volcanoes are most common in these geologically active boundaries. The two types of plate boundaries that are most likely to produce volcanic activity are divergent plate boundaries and convergent plate boundaries. At a divergent boundary, tectonic plates move apart from one another.
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Volcanoes are grouped into four types: cinder cones, composite volcanoes, shield volcanoes and lava volcanoes. Cinder cones are circular or oval cones made up of small fragments of lava from a single vent that have been blown into the air, cooled and fallen around the vent. ... Helens are examples of this type of volcano.
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Volcanic eruptions happen when lava and gas are discharged from a volcanic vent. ... Volcanic eruptions often cause temporary food shortages and volcanic ash landslides called Lahar. The most dangerous type of volcanic eruption is referred to as a 'glowing avalanche'.
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['Pyroclastic Density Currents (pyroclastic flows and surges)', 'Lahars.', 'Structural Collapse: Debris flow-Avalanches.', 'Dome Collapse and the formation of pyroclastic flows and surges.', 'Lava flows.', 'Tephra fall and ballistic projectiles.', 'Volcanic gas.', 'Tsunamis.']
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Volcanic eruptions happen when lava and gas are discharged from a volcanic vent. The most common consequences of this are population movements as large numbers of people are often forced to flee the moving lava flow. Volcanic eruptions often cause temporary food shortages and volcanic ash landslides called Lahar.
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['1.1 Avalanches and landslides.', '1.2 Earthquakes.', '1.3 Sinkholes.', '1.4 Volcanic eruptions.']
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Non-explosive eruptions of lava and less-violent explosive eruptions have occurred in and near the Yellowstone caldera since the last supereruption. The most recent lava flow occurred about 70,000 years ago, while a violent eruption excavated the West Thumb of Lake Yellowstone around 150,000 years ago.
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Volcanoes are formed by eruptions of lava and ash when magma rises through cracks or weak-spots in the Earth's crust. A build up of pressure in the earth is released, by things such as a plate movement which forces molten rock to exploded into the air causing a volcanic eruption.
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['Sills: form when magma intrudes between the rock layers, forming a horizontal or gently-dipping sheet of igneous rock. ... ', 'Dykes: form as magma pushes up towards the surface through cracks in the rock. ... ', 'Batholiths:']
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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. The eruptions from these volcanoes may be a pyroclastic flow rather than a flow of lava.
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In general, the more felsic the magma the greater the volatile content. So mafic/basaltic volcanoes are fairly quiescent, intermediate/andesitic volcanic eruptions are moderately explosive, and felsic/rhyolitic volcanoes may be extremely explosive. ... Their high volatile content makes them potentially highly explosive.
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The primary factors that determine the nature of volcanic eruptions include the magma's temperature, its composition, and the amount of dissolved gases it contains.
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The three main types of volcanoes are cinder cones, composite cones, and shield cones. Cinder cones are the smallest kinds of volcanoes and are formed by bursts of gasses, mostly that of pyroclastic material.