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Volcanoes

Volcanoes. A Lesson Plan Written By Tom Huettl. Lecture Outline. Areas of Volcanism Types of Volcanoes Types of Lava Viscosity. Lecture Outline. Areas of Volcanism Types of Volcanoes Types of Lava Viscosity. Areas of Volcanism. Sub-ducting Boundaries

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Volcanoes

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  1. Volcanoes A Lesson Plan Written By Tom Huettl

  2. Lecture Outline • Areas of Volcanism • Types of Volcanoes • Types of Lava • Viscosity

  3. Lecture Outline • Areas of Volcanism • Types of Volcanoes • Types of Lava • Viscosity

  4. 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

  5. Cont.-Cont/ Subducting Graphic taken from : http://147.205.15.81/geology/work/VFT-so-far/orogeny/pl.tect.html

  6. Oceanic-Oceanic/Suducting Graphic taken from: http://147.205.15.81/geology/work/VFT-so -far/orogeny/pl.tect.html

  7. Mid Ocean Ridges

  8. Areas of Volcanism • Hot Spots • Hot Spots remain stationary while plates move above

  9. Hot Spots Graphic taken from: http://volcano.und.nodak.edu/vwdocs/vw/lessons/atg.htm l

  10. 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

  11. 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

  12. Shield Cone

  13. Composite Cone/Stratovolcano

  14. Cinder Cone

  15. Types of Lava • Mafic • Silica Poor (45-52%) • Intermediate • Silica Composition (53-65%) • Felsic • Contains more than 65% Silica

  16. High Viscosity Slow Flow High Silica Content Low Viscosity Fast Flow Low Silica Content Viscosity UMD

  17. For More Information Visit One of The Following Links The Web's Premiere Source For Volcanoes U.S. Geological Survey, Volcano Hazards Program

  18. 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,EXP950_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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