What happened to the igneous and sedimentary rock formations during plate motion?

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Here is your answer !

At diverging plate boundaries, convection currents bring hot magma to the surface. This hot magma flows out onto the ocean floor, forming extrusive, finely grained igneous rocks. At convergent plate boundaries, sedimentary rock from the ocean floor gets pushed down into the mantle.

[Sorry ,but there is no explanation in this question]

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