Geography AQA GCSE

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Conservative plates

this where 2 plates move side to side together for example the san andreas fault in the USA

At this type of plate boundary you get 

  • earthquakes as the plates move and lock together
  • no other land forms form as you don't have magma coming to the surface 
  • no land is made or lost from this action 
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Destructive plates

this is where you get an oceanic plate colliding into a continental plate and this causes subductiion of the the heavy dense basaltic oceanic plate under the light granite contiental plate . you can also have 2 continental plates moving towards one another and this can form fold mountain ranges as it creates a geosyncline which can be filled with sediment that is compacted through the movement of the plates and this forms sedimentary rock which is folded and squashed to form mountains

extra information 

  • in this plate movement land is lost as rock is destroyed through melting in the mantle
  • at this plate boundary type volcanoes are formed and earthquakes can occur 
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Constructive plate boundaries

At this plate boundary type magma rises to the surface an cools to form new rock as the plates move apart from one another an example of this is the mid atlantic ridge

extra information 

  • Volcanic islands such as the one off the coast of iceland ( i forget its name - please google it if you are interested) form on this kind of plate boundary , maybe even iceland too 
  • Volcanoes form ( on land and under the sea ) on this type of boundary
  • earthquakes can happen on this type of palte boundary but are not a comman 
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