Question

How does convectional currents cause earth movements?

Answer 1

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