7th Grade Ch. 3 Sec. 1 Volcanoes and Plate Tectonics
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7th Grade Ch. 3 Sec. 1 Volcanoes and Plate Tectonics

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7th Grade Ch. 3 Sec. 1 Volcanoes and Plate Tectonics 7th Grade Ch. 3 Sec. 1 Volcanoes and Plate Tectonics Presentation Transcript

  • Ch. 3 Sec. 1 Volcanoes & Plate Tectonics
    • weak spot in crust where molten material comes to surface
    http://www.youtube.com/user/NyeTunes#p/u/89/HUCBf058hoA
  •  
  • magma
    • molten rock from mantle beneath Earth's surface
  • lava
    • magma that reaches surface
    http://www.youtube.com/watch?v=K9iZd6wzlCk&feature=related
  • pillow lava lava entering the ocean
  • buried road in Hawaii
  • After lava has cooled, it forms solid rock.
  •  
    • Although you might not wish to touch lava with a "ten foot pole“, this potentially hazardous activity is all in a day's work for a volcanologist.
    • The long pole contains a special probe that can measure the temperature of the lava.
  • Ring of Fire
    • major volcanic belt formed by many volcanoes that rim Pacific Ocean
  • Volcanic belts form along the boundaries of Earth’s plates.
  • Ring of fire
  • most volcanoes occur: along diverging plate boundaries along converging plate boundaries mid-ocean ridge in subduction zones
  • volcanoes at converging boundaries subduction causes oceanic crust to sink through a deep-ocean trench into mantle  crust melts & forms magma  magma rises back to surface  forms volcanoes
  • Volcanoes often form where two oceanic plates collide or where an oceanic plate collides with a continental plate. In both situations, an oceanic plate sinks through a trench. Rock above the plate melts to form magma, which then erupts to the surface as lava.
  • island arc
    • string of islands created by volcanoes
    • examples:
    • Japan
    • New Zealand
    • Caribbean islands
    • Phillipines
  •  
  • hot spot
    • area where magma from deep within mantle rises & melts thru. crust
    • can occur:
      • in middle of plates
      • on or near plate boundaries
      • under continents
    • eg:
      • Hawaii
      • Yellowstone National Park
  • Hot Spot Volcanoes
    • A volcano forms above a hot spot when magma erupts through the crust and reaches the surface.
  •  
  •  
  • The Hawaiian Islands formed one by one over millions of years as the Pacific plate drifted over a hot spot.