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The big main cause is convection currents, circular cycles of hot magma in the earth's mantle. The magma heats up and rises to the surface of the earths crust at a divergent boundary.This creates new land and pushes the plates at the divergent boundary apart. Then, on the other side of the earth, the plates of a convergent boundary collide. Usually, one plate goes under the other, into a subduction zone; the one on top becomes a mountain or something. The plate that went underneath melts under the extreme heat beneath the earth's crust and becomes hot magma. This is the cycle of the land on earth. As mentioned earlier, the divergent boundaries push plates apart, moving them around the globe.

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13y ago

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