Plate Boundaries

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  • Plate Boundaries
    • Destructive boundary
      • Cause of Earthquake at:
        • The thin, dense oceanic plate is subducted under the thick, light continental plate because it is heavier.
        • As convection currents in the mantle move them
        • They snag the tension builds like a machine without oil.
        • A sudden movement sends out shockwaves.
        • E.G. Japan where Pacific plate is subducted under Okhotosk plate.
      • Cause of Volcano at:
        • Plates move towards each other
        • thin, heavy oceanic crust subducted under thick continental crust with lots of friction.
        • Subduction zone is made as oceanic crust melts and ocean trench forms as crust is pulled down.
        • as plates move, causes friction, which increases temperature.
        • Melts the oceanic rock as it re-enters magma.
        • lighter, denser rock forced up through cracks in continental crust, volcanos erupt.
        • Plates snag and tension builds up a sudden movement send out shockwaves.
    • Constructive boundary
      • Causes of Earthquake at:
        • Plates move away from each other at Mid Ocean Ridge with convection currents in mantle.
        • Magma rises in the middle.
        • A sudden movement sends out shockwaves.
        • Causes an Earthquake.
        • E.G. Eurasian plate and N. American plate moving away from each other (continental drift).
      • Causes of Volcanos at:
        • Plates move away from each other at Mid Ocean Ridge with convection currents in the mantle.
        • Magma rises along Mid Ocean Ridge
        • New land is formed as magma solidifies.
        • Volcanoes form
    • Conservative boundary
      • Causes of an Earthquake at:
        • Plates move past each other, but at different speeds.
        • They snag and tension builds up like a machine without oil.
        • A sudden movement sends out shockwaves.
        • Causes an Earthquake, e.g. San Andreas Fault.

Comments

/Lucas/Austin/

This is really helpful!! Cheers

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