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How does convectional currents cause earth movements?

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Convectional currents cause earth movement as;

  • Convectional currents are found within the molten rocks of the mantle
  • The currents cause the molten rock to circulate in a cyclical manner
  • These current move from inside the mantle towards the surface of the mantle and then horizontally and finally vertically inwards
  • As the currents move horizontally beneath the sima they exert a frictional pull on the crustal rocks causing them to move horizontally
  • When these currents meet them beneath the crust they sink inwards causing the rocks directly above the convergence point to move vertically inwards
  • This causes both horizontal and vertical movements in the earth’s crust
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