What is the process of chemical differentiation?
A) the separation of different chemical compounds into different regions of the solar nebula; e.g., rocky grains in the inner nebula, icy grains in the outer nebula
B) the sinking of heavy material to the center of a planet or other object and the rising of lighter material toward the surface
C) the condensation of different chemical compounds at different temperatures and therefore at different times-iron first, rock next, and ices last
D) a separation of different chemical compounds into different types of grains in any given part of the solar nebula; e.g., grains of ice, rock, and iron
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