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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

Volcanoes

A Lesson Plan

Written By

Tom Huettl

lecture outline
Lecture Outline
  • Areas of Volcanism
  • Types of Volcanoes
  • Types of Lava
  • Viscosity
lecture outline4
Lecture Outline
  • Areas of Volcanism
  • Types of Volcanoes
  • Types of Lava
  • Viscosity
areas of volcanism
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
Cont.-Cont/ Subducting

Graphic taken from

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

oceanic oceanic suducting
Oceanic-Oceanic/Suducting

Graphic taken from:

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

areas of volcanism9
Areas of Volcanism
  • Hot Spots
    • Hot Spots remain stationary while plates move above
hot spots
Hot Spots

Graphic taken from:

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

l

types of volcanoes
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 volcanoes12
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
types of lava
Types of Lava
  • Mafic
      • Silica Poor (45-52%)
  • Intermediate
      • Silica Composition (53-65%)
  • Felsic
      • Contains more than 65% Silica
slide17
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
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
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/