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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

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

  • Plate Sub-ducts below surface into mantle

    Oceanic-Oceanic

  • Volcanoes form near boundary

    Mid Ocean Ridges

  • Eruptions occur where plates are diverging


Cont.-Cont/ Subducting

Graphic taken from

: http://147.205.15.81/geology/work/VFT-so-far/orogeny/pl.tect.html


Oceanic-Oceanic/Suducting

Graphic taken from:

http://147.205.15.81/geology/work/VFT-so -far/orogeny/pl.tect.html


Mid Ocean Ridges


Areas of Volcanism

  • Hot Spots

    • Hot Spots remain stationary while plates move above


Hot Spots

Graphic taken from:

http://volcano.und.nodak.edu/vwdocs/vw/lessons/atg.htm

l


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


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


Shield Cone


Composite Cone/Stratovolcano


Cinder Cone


Types of Lava

  • Mafic

    • Silica Poor (45-52%)

  • Intermediate

    • Silica Composition (53-65%)

  • Felsic

    • Contains more than 65% Silica


  • 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

    The Web's Premiere Source For Volcanoes

    U.S. Geological Survey, Volcano Hazards Program


    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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