AS Marine Science - theory of plate tectonics

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  • Plate tectonics
    • Theory
      • Earth's surface was once one land mass
      • Lithosphere made up of plates which float on the underlying asthenosphere
      • Plates moving because underlying mantle is moving
      • Evidence
        • Fit between coastlines of continents on opposite sides of the Atlantic ocean (supports idea of single land mass)
        • Identical fossils found in South America and Africa, supporting idea of a single land mass
        • Magnetic stripes on sea floor, supporting idea of seafloor spreading


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