Volcanoes A Lesson Plan Written By Tom Huettl Lecture Outline »Areas of Volcanism »Types of Volcanoes »Types of Lava »Viscosity.

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Presentation transcript:

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 :

Oceanic-Oceanic/Suducting Graphic taken from: -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: 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 » 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 _NAV2-77_SWK953,00.htmlhttp:// 950_NAV2-77_SWK953,00.html