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Volcanoes Resources

Page history last edited by coylem@... 11 years, 10 months ago

Textbook Connection:

Read Chapter 7

7.1  Volcanoes and Plate Tectonics

7.2  Volcanic Eruptions

 

Discovery Channel Videos of Volcanic Processes (from the eruption of Mt. St. Helens to pyroclastic flows)

 

Types of Volcanoes:

 

  1. Shield volcanoes
  2. Composite (Strato-) volcanoes
  3. Cinder cone volcanoes 

 

Types of Lava:

 

Mafic:

  • dark colored (when hardened), rich in Mg (magnesium) and Fe (iron). Forms oceanic crust.
  • Mafic lava has a low viscosity and flows easily.
  • Seen in slow erupting Shield Volcanoes and hardening into Basalt (extrusive) or Gabbro (instrusive).                
  • Dominant at Mid-Ocean ridges, Oceanic Hot Spots (Shield Volcanoes of Hawaii), Island Arcs and can be found at Rift Valleys, Continental Hot Spots (Yellowstone). 

 

Felsic:  

  • lighter colored (when hardened), rich in Si (silica). Forms continental crust.
  • Felsic lava has a high viscosity and DOES NOT FLOW EASILY.
  • Seen in continental Composite or Stratovolcanoes and result in EXPLOSIVE eruptions.  Ex. Cascade Mts. and Mt. St. Helens.  Can harden into granite (intrustive) and less likely rhyolite (extrusive).
  • Dominant at Oceanic: Continental Convergent plate boundaries/subduction zones and can be found at Continental Hot Spots (Yellowstone). 

 

 

Volcano Class Resources:

 

Volcanoes and Other Igneous Activity.ppt


USGS Volcano Hazards Program

 

Mafic vs Felsic lava explained

 

World Volcano Map.pdf

 

Volcanic Environments.ppt

 

Volcanoes Interactive Lesson

 

Take an interactive dive to an active submarine volcano

 

Case of the Missing Rumbleometer

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