Geology ~ Plate Tectonics

The Theories Of Plate
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1) Theories?
1) Convection currents, ridge push, slab pull.
2) Convection currents?
2) Currents in upper and lower mantle causing the movements.
3) Ridge Push?
3) Rising magma ejected at MOR forces plates apart.
4) Slab Pull?
4) Gravity pulls the subducting oceanic plate downwards.
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