plate boundaries

  • Created by: Maiaerin
  • Created on: 10-06-18 14:41
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  • Plate Boundaries
    • destructive boundaries
      • destructive boundaries are where two plates are moving towards each other.
      • where an oceanic plate meets a continental plate, the denser oceanic pate is forced down into the mantle and destroyed.
        • this often creates volcanoes and ocean trenches (very deep sections of the ocean floor where the oceanic plate goes down).
      • example: the pacific plate is being forced under the Eurasian plate along the east coast of japan.
    • collision plate boundaries
      • in collision plate boundaries, both plates are made from continental crust and move towards each other.
      • neither plate is forced down into the mantle - instead both plates are folded and forced upwards, creating fold mountains.
      • example: the Eurasian and Indian plates are colliding to form the Himalayas.
    • constructive boundaries
      • constructive boundaries are where two plates are moving away from each other.
      • magma (molten rock) rises from the mantle to fill the gap and cools, creating new crust.
      • example: the Eurasian plate and the north American plate are moving apart at the mid-Atlantic ridge.
    • conservative boundaries
      • conservative boundaries are where two plates are moving sideways past each other, or are moving in the same direction, but at different speeds.
      • crust isn't created or destroyed
      • example: the pacific plate is moving past the north American plate on the west coast of the USA, e.g. at the san andreas fault.

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