The cores of the terrestrial worlds are made mostly of metal because

Question

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The most widely accepted theory for the metal-rich cores of the terrestrial worlds is that they formed as these planets grew and the interiors became hot enough to melt. At high temperatures, metals sank toward the center by settling through the molten rock, a process called differentiation. Over time, this settling of dense materials led to the metallic cores of the planets reversing polarity in the magnetic field.

The Cores of the Terrestrial Worlds Are Made Mostly of Metal