volcano - Volcanic Eruptions Volcanic 50-60 per year...

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Volcanic Eruptions Volcanic Eruptions 50-60 per year worldwide US: 2-3 per year (mostly Alaska) In the past 100 years, ~100,000 In the past 100 years, ~100,000 people killed worldwide by volcanic people killed worldwide by volcanic eruptions eruptions
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Most Recent Volcanic Activity 2008: Cleveland Volcano, Chuginadak Island, Alaska Mt. Cleveland-5,675-foot-tall stratovolcano. Small ash cloud, lava flow recorded 7/21/08. Ash plume rose 10-20,000 feet above s.l.
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World’s Active Volcanoes: Ring of Fire outlines subduction zones.
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U.S. Active Volcanoes
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Tectonic Settings for Volcanism Tectonic Settings for Volcanism Convergent plate boundaries “Ring of Fire” Divergent plate boundaries Within plates - “Hotspots” Shield Volcanoes and Calderas
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Plate Tectonic Settings
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Fig. 6.02 W. W. Norton Volcano Volcano - mountainous accumulation of material built from repeated lava and/or pyroclastic flows .
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Plumbing System of a Volcano
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Shiprock, New Mexico: exposed volcanic pipe
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Fig. 09.10 W. W. Norton Crater Crater - steep-walled, circular depression located at summit of many volcanoes.
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Caldera large collapse structure produced during eruptions and emptying of magma chamber.
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Factors Controlling Factors Controlling Volcanic Activity Volcanic Activity 1) Composition of lava: higher silica (SiO 2 ) % - higher viscosity* of lava. 2) Temperature: higher temperature, lower viscosity.
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This note was uploaded on 12/01/2011 for the course SCIENCE 460:100 taught by Professor Staff during the Fall '10 term at Rutgers.

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volcano - Volcanic Eruptions Volcanic 50-60 per year...

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