State three causes of earth movements

Answer:

-Movement of magma within the crust which causes vertical or horizontal displacement of rocks
-Gravitational pull exerts pressure on crustal rocks which are above large cavities left by magma that has escaped, causing them to move inwards to fill the cavities
-Convectional currents in the mantle which when moving horizontally beneath the sima,exert a frictional pull on the crustal rocks causing them to move horizontally
-Isostatic adjustment when sima and sial act to the maintain a state of balance within the earths crust

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