Which best explains how the collisions of materials in space contribute to the formation of layers in protoplanets?

Collisions between materials in a forming protoplanet release energy as heat. The heat can melt the materials, allowing denser substances to sink toward the center while less dense substances rise. This separation forms layers, so the best choice is “The collisions release heat, which results in the heating and subsequent melting, sinking, and rising of materials.”

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