Main Points of the Theory of Plate Tectonics Midocean ridges form at very large large cracks in

Molten magma fries through the crack and cools to form new

New Magma from below pushes up, causing the seafloor to

Midocean ridges form at very large cracks in the ocean.

Molten magma fries through the crack and cools to form new land.

New magma from below pushes up, causing the seafloor to spread (divergent boundary).

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