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Seafloor spreading is a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other. ... As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense

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Magma comes out of the rift valley.

Magma cools to rock and hardens.

Rock is pushed away as new rock is formed at MOR.

Oceanic crust and continental crust meet at the trench.

Oceanic crust bends down under the continental crust.

Gravity pulls rock towards mantle.

Rock melts to mantle.

Explanation:

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