"Chemical differentiation" in planetary sciences refers to
A) the formation of rocky planets in the hotter,inner solar system and gas giants in the colder,outer regions.
B) the circulation of iron in the core of a planet,resulting in the generation of a magnetic field.
C) the large-scale convection of rock in the mantle of a planet,which on Earth causes continental drift.
D) the sinking of heavier elements toward the center of a planet and the floating of lighter elements toward the surface.
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