Plate Tectonics

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  • Plate Tectonics
    • Evidence
      • Fossil Evidence
        • ancient mesosaur reptiles
        • gigantic glossopteris ferns
        • similar aged rocks
        • South America, Africa, India, Antartica
        • Separated by salt water
      • Parallel Nature of the Continents
        • Alfred Wegner
        • world had formally been 1 land mass
        • Pangaea
        • Africa and South America fit together
      • Sonar Testing
        • oceans were not deep
        • huge, linear, underwater mountain ranges
        • continents moving apart
        • Mid-Atlantic ridge
      • Earthquake and Volcano Distribution
        • repeated pattern
        • exists as a result of plates moving
        • Pacific Ring of Fire
    • What is it?
      • the plates are floating on top of the mantle
      • the theory that the earths crust is divided into large plates
      • the plates move
    • Crust
      • Continental
        • thick 10-60km
        • less dense 2.7gm/m3
        • Granitic SIAL
        • from 1000 to 3500 million years old
      • Oceanic
        • thin 5-7km
        • denser 3gm/m3
        • Basalt SIMA
        • less than 250million years old
    • Plate Margins
      • Away
        • constructive plate margin
      • Towards
        • destructive/ collision plate margin
      • Past
        • conservative plate margin

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