Types of Plate Margin

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  • Created by: Lotto65
  • Created on: 12-12-15 16:55

Destructive Plate Margins

1) Plates come together due to convection currents in the mantle

2) One is oceanic crust, one is continental crust

3) The oceanic crust sinks below the continental crust because it is denser and heavier- SUBDUCTION

4) Great pressure is exerted as it is forced down into the mantle- EARTHQUAKES

5) The friction and heat from the mantle causes the oceanic crust to be destroyed (MELTS) into magma

6) The large volume of magma now in the magma chamber causes hot magma to rise to the surface- COMPOSITE VOLCANO

Forms OCEANIC TRENCHES, COMPOSITE VOLCANOES AND EARTHQUAKES

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Constructive Plate Margins

1) Plates move apart due to convection currents in the mantle

2) This forms cracks and fractures to form between the plates where there is no solid crust

3) Magma rises between these cracks and to the surface- SHIELD VOLCANO

4) This cools to form new crust and land

Forms SHIELD VOLCANOES, OCEANIC RIDGES

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Conservative Plate Margin

1) Two plates slide past each other at similar angles, direction and speeds due to convection currents in the mantle

2) Or they could be in the same direction but at different speeds

3) Occasionally, these plates get stuck

4) Pressure builds up as they continue to move

5) Eventually this pressure causes the plates to be released- EARTHQUAKES

Forms EARTHQUAKES

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Collision Margins

1) Two continental crusts come together due to convection currents in the mantle

2) One does not sink because they have the same density

3) Therefore, they meet and collide

Forms FOLD MOUNTAINS

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