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_______ is the process in planetary formation when heavy materials sink toward the planet's center and lighter materials accumulate near its surface. 

AOrogenyB. SuperpositionC. RatificationD. Differentiation

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meerkat18

The correct answer is letter D. Differentiation is a process where different layers of a planetary body are separated into layers. This occurs in the development of protoplanets. With heavy materials sinking toward the planet's center, it creates a dense core with lighter elements toward the surface. This supports why iron is concentrated in the core.

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