[ppt]powerpoint presentation - university of texas at … · web viewchapter 4 -volcanism &...
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Chapter 4 -Volcanism & Extrusive Rocks
Photo Credit: S. Young
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Effects on Humans
• The Growth of Hawaii• Geothermal Energy• Effect on Climate• Volcanic Catastrophes• Eruptive Violence and Physical Characteristics of
Lava
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Cascades Volcanoes
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Mt. St. Helen’s Eruption Sequence
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Gary Rosenquist Photo Sequence - Mt. St. Helen’s, May 18, 1980
~8:27 PDT8:32:47.0 PDT8:32:49.2 PDT8:32:53.3 PDT8:33:03.7 PDT8:33:18.8 PDT
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Mt. St. Helen’s Animation
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Mt. St. Helen’s Plinian Eruption Column - May 18, 1980
From: USGS http://vulcan.wr.usgs.gov/
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Mt. St. Helen’sMay 18, 1980 Devastation
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Post May 18, 1980 Crater and Resurgent Dome
From: USGS http://vulcan.wr.usgs.gov/
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Caldera Collapse
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Crater lake - Wizard Island - 5 kBP Eruption Mt. MazamaCrater lake, Wizard Island, OR8 kBP Eruption Mt. Mazama
From: http://www.igoweb.org/~wms/personal/photos/2000/craterLake/
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Pyroclastic Flows
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St. Pierre Devastation, Mt. Pelee, Martinque, May 8, 1902
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Extrusive Rocks and Gases
• Scientific Investigation of Volcanism• Gases
Extrusive Rocks
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Volcanic Textures Table
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Obsidian Hand Specimen
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Andesite Hand Specimen
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Andesite Photomicrograph
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Vesicular Basalt
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Pumice
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Volcanic Bombs
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Volcanic Tuff Photomicrograph
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Types of Volcanoes
• Shield Volcanoes• Cinder Cones• Composite Volcanoes• Volcanic Domes
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Basic Volcano Types
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Karymsky Volcano, Kamchatka, Russia
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Shield Volcano
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Basaltic Fire Fountaining and Lava Flows
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Summit of Mauna Loa
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Pahoehoe Lava Flow
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Aa Lava Flow
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Spatter Cone
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Olympus Mons, Mars
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Volcanic Eruption, Io