Plate boundaries: Completed

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  • Created by: Janelle M
  • Created on: 07-06-18 12:57
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  • Plate boundaries
    • Convergent plate boundaries
      • A convergent plate boundary, also known as a destructive plate boundary
      • it usually involves an oceanic plate and a continental plate
      • the plates move towards one another and this movement causes earthquakes
    • Subduction
      • the plates collide
      • the oceanic plate is forced beneath the continental plate
      • this happens because the oceanic plate is heavier than the continental plate
    • Composite volcano
      • when the plate sinks into the mantle it melts to form magma
      • the pressure of the magma builds up beneath the earth's surface
      • the magma escapes through weaknesses in the rock and rises through a composite volcano. The volcanic eruptions are often violent, with lots of steam, gas, and ash
    • Collision boundary
      • the land buckles upwards to form fold mountains
      • if two continental plates collide, neither can sink
      • earthquakes can occur at collusion boundaries
    • Divergent plate boundaries
      • the plates move apart from one another
      • when this happens the magma from the mantle rises to make or construct new land in the form of a shield volcano
      • the movement of the plates over the mantle can cause earthquakes
    • conservative plate boundaries
      • the plates move past each other or side by side
      • moving at different speeds. Friction occurs as plates try to move and become stuck.
      • Pressure builds up because the plates are still trying to move.
      • When the pressure is released, it sends out huge amounts of energy, causing an earthquake.
      • The earthquakes at a conservative plate margin can be very destructive as they occur close to the Earth's surface.
      • There are no volcanoes at a conservative plate boundary.

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