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Volcanoes A Lesson Plan Written By Tom Huettl
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Lecture Outline »Areas of Volcanism »Types of Volcanoes »Types of Lava »Viscosity
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Lecture Outline »Areas of Volcanism »Types of Volcanoes »Types of Lava »Viscosity
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Areas of Volcanism Sub-ducting Boundaries Plate Sub-ducts below surface into mantle Oceanic-Oceanic Volcanoes form near boundary Mid Ocean Ridges Eruptions occur where plates are diverging
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Cont.-Cont/ Subducting Graphic taken from : http://147.205.15.81/geology/work/VFT-so-far/orogeny/pl.tect.htmlhttp://147.205.15.81/geology/work/VFT-so-far/orogeny/pl.tect.html
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Oceanic-Oceanic/Suducting Graphic taken from: http://147.205.15.81/geology/work/VFT-so -far/orogeny/pl.tect.html
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Mid Ocean Ridges
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Areas of Volcanism –Hot Spots Hot Spots remain stationary while plates move above
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Hot Spots Graphic taken from: http://volcano.und.nodak.edu/vwdocs/vw/lessons/atg.htm l
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Types of Volcanoes –Shield Cone Has a low rounded profile Gentle slopes of 2-10 degrees –Composite Volcano (Strato Volcano) Both pyroclastic layers and lava flows Steep sided near summit with decreasing slope
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Types of Volcanoes Cinder Cone –Pyroclastic Material (Fragmented material that has been explosively ejected) –Ash and debris accumulates around the vent –Small steep sided cones –
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Shield Cone
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Composite Cone/Stratovolcano
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Cinder Cone
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Types of Lava Mafic »Silica Poor (45-52%) Intermediate »Silica Composition (53-65%) Felsic »Contains more than 65% Silica
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–High Viscosity »Slow Flow »High Silica Content » –Low Viscosity »Fast Flow »Low Silica Content » UMD
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For More Information Visit One of The Following Links The Web's Premiere Source For Volcanoes U.S. Geological Survey, Volcano Hazards Program
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Electronic Resources http://147.205.15.81/geology/work/VFT-so-far/orogeny/pl.tect.html http://volocano.und.nodak.edu/vwdocs/vwlessons/atg.html http://www.studyworksonline.com/cda/content/worksheet/0,1036,EXP 950_NAV2-77_SWK953,00.htmlhttp://www.studyworksonline.com/cda/content/worksheet/0,1036,EXP 950_NAV2-77_SWK953,00.html http://observe.ivv.nasa/earth/tectonics/Tectonics.html http://members.aol.com/waponi/sound.htm http://www.bftr.com/Pages/projects/dante.html http://volcanoes.usgs.gov/
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