GLY 1880 Topic 7
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Hydrovolcanic eruptions are rarely explosive
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False
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The various types of volcanic debris that settles out of the air are called
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pyroclastic
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Mt Rainier, Mt Vesuvius and Mt Fuji are all examples of what type of volcano
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Stratovolcano
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Pyroclastic flows move much faster than basalt flows
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True
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Volcanoes with magma of high silica content are generally more explosive than those with magmas of low silica content
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True
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Extinct volanoes are ones that have not been active or shown any signs of activity in the form of gas emissions, geothermal activity, earthquakes, or ground subsidence and uplift during the past how many years?
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10,000 years
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This type of volcanic rock is intermediate in composition between basalt and rhyolite
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Andesite
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A particular type of mudflow or debris flow composed of mixture of pyroclastic material and water, which flows rapidly down volcanic sloped with tremendous force, is called a
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Lahar
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Capulin volcano in New Mexico and Sunset Crater in Arizona are both
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scoria cones
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What kind of volcano is Mauna Loa in Hawaii?
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Shield volcano
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This style of eruption involves rhyolitic or andesitic magmas and usually begins with very powerful explosive eruptions of incandescent pyroclastic flows capable of sweeping away even the strongest structures
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Peleean
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This type of volcanic rock is often buoyant enough to float on seawater
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pumice
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Formation of this feature occurs after the explosive phase of an eruption when the magma becomes depleted in volatiles or gases. With the reduction of gas, the viscous lava rises out of the vent to produce this feature in the summit crater
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lava dome
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Which igneous rock type is produced at spreading ocean ridges
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Basalt
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Volcanoes of this type have steep slopes, as much as 30 degrees near the summit and tapering down to 4 to 5 degrees near the base, and are composed of igneous rock from flows and pyroclastic materials
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Stratovolcano
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This national park features a lake within a caldera
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Crater Lake National Park
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Brief eruptions of pyroclastic material produces these steep-sided volcanoes, often slopes of 30 to 35 degrees that are seldom more than 500 to 1000 in height
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scoria cone
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This volcanic feature forms by the explosion and collapse of a volcano summit to form a basin at the summit of the volcano
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Caldera
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What term describes a variety of volcanic eruptions from small to ones with an eruptive column of around a kilometer? this style of eruption is short-lived and ejects viscous or pasty lava tens or hundreds of meters in the air
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Strombolian
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This region of the Pacific Northwest was formed by voluminous fissure eruptions
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Columbia River Plateau
