Types of Plate Margins
The Restless Earth AQA Geography A text book
- Created by: Abbie Hutchinson
- Created on: 12-06-12 09:31
Destrctive Plate Margins
- Oceanic crust is Denser than the continental crust.
- The Oceanic crust therefpre sinks below the continental.
- This is know as SUBDUCTION.
- as the plate decends under the continental crust it starts starts to melt due to friction of the moveming plate boundaries, this causes earthquakes.
- Magma rises throught the gaps in the continetal plate, if it seeps through it causes a volcano.
Constructive
- Two plates move apart.
- Magma rises up to fill the gap , which forms a volcano.
- However the volcano doesnt errupt with much force because the magma can escape easily at the surface.
- Earthquakes also occur at a constructive boudary.
Collision Boundary
- When 2 plates are of a similar density and move together
- The material between them buckles and rises up forming fold mountains
- Eg. The Himalayas The Africian Plate collding into the Eurasian plate
Conservative Boundary
- Two plates slide past each other at a fault.
- NO Volcanos are found along these boundarys but earthquakes do occur.
- The stress builds up and when it reaches a critical value it slips and causes an earthquake.
- An Example is the San Andreas Fault in California.
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