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Volcanoes PowerPoint PPT Presentation


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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Volcanoes l.jpg

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.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

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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

    Viscosity

    UMD


    For more information visit one of the following links l.jpg

    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,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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