Plate Boundaries
- Created by: emilypountain
- Created on: 16-10-15 10:08
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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.
- Cause of Earthquake at:
- 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
- Causes of Earthquake at:
- 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.
- Causes of an Earthquake at:
- Destructive boundary
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