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As the plates move away from each other at divergent boundaries, the lithosphere becomes thinner. A set of deep cracks form in the rift zone. The convection currents of the mantle can form a weak spot, and the heated, less dense magma rises up to fill the gap.

Seafloor Spreading

Magma rises from magma chambers at the rifts in the sea floor. Cooling and hardening then occurs.

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