Plate boundaries

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  • Created by: Anya
  • Created on: 07-05-14 19:31
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  • Plate boundaries
    • Constructive
      • Two plates moving apart from eachother
      • Convection currents move in opposite directions
        • Cracks form and magma escapes
          • Magma fills gaps and cools to form new land
            • Can result in both volcanoes and earthquakes
    • Destructive
      • Two plates move together
      • Oceanic plate is pushed towards continental by convection currents
        • Oceanic sinks due to it being denser
          • Plate melts as it descends
            • Magma gets through cracks
              • Forms ocean trenches, mountains and volcanoes
    • Conservative
      • Two plates slide in opposite directions
      • Stress builds as plates snag and grind
        • Stress is released and causes earthquakes


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