Plate Tectonics Intro
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Plate Tectonics Intro

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Plate Tectonics Intro Plate Tectonics Intro Presentation Transcript

  • Introduction: Theory of Plate Tectonics
  • 4600000000 Years Old!
    • Difficult to fathom as our life spans only 80
    • Simplified history of Earth – Waugh pg. 9
    • Oldest rocks are ~ 4 billion years old
    • Found in the Northwest Territories
    • Internal Structure of the Earth
    Crust Sima-Oceanic Sial-Continental View slide
  • Internal Structure of the Earth Below the Crust is the Mantle, which is relatively rigid! Asthenosphere is part of the Mantle, that semi molten Confused yet… View slide
  • Theory of Plate Tectonics Alfred Wegener’s 1915 drawing of Pangaea
  • Continental Drift
  • Major Plates
  • How do Plates Move?
  • Good Fit What is some Evidence to support his Theory
  • Rocks & Mountains
  • Fossils
  • Sea Floor Spreading
  • Age of the Sea Floor
  • Evidence for the Theory
    • Continental shelves seem to fit together
    • Rock units and mountain ranges fit Pangaea
    • Fossil types fit Pangaea
    • Ocean research uncovered sea floor spreading
    • Radio-geology allowed us to date the age of rocks
    • Polarity of Rocks-Magnetic Evidence
  • Why do we Care?
    • Curiosity
    • Explain landforms
    • Find valuable minerals
    • Explain and predict potential hazards
  • Plate Boundaries Where the Action Is
    • Where new land is created
    • Where most the most interesting landforms are found
    • Where most Earthquakes & Volcanoes occur
  • Earth Quakes and Volcanoes
  • What Happens at Plate Boundaries?
  • Subduction Boundary Ocean to Ocean
  • Satsuma Iwojima – Cinder Cone Volcano , Japan
  • Subduction Boundary Ocean to Continent
  • Mt. Rainer, Washington State
  • Subduction Boundary Continent to Continent
  • Sagarmatha - Himalayas
  • Divergent Boundary
  • Ocean Ridges
  • East African Rift Valley
  • Collision Boundary
  • Eastern Sierra Fold Mountains
  • Transform Boundary
  • San Andreas Fault - California
  •  
  •  
  • Hot Spots
  • Haleakula Crater, Maui Hot Spot Volcano