• Plate tectonics
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  • What term is used to describe the crust and the uppermost part of the mantle?
    Lithosphere
  • Describe Alfred Wegener's Theory of Continental Drift.
    The Earth's crust is separated into sections called plates. The plates are slowly drifting across the Earth's surface.
  • Which term is used to describe the upper portion of the mantle where convection currents occur?
    Asthenosphere
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