The Outer Core of Earth Is Molten, but the Inner

The outer core of Earth is molten, but the inner core is solid. The reason for this is that the:

A) actual temperature is below the melting point of the core material at the high pressure of the interior.
B) lower pressure in the inner core allows the material to freeze out of the molten rock.
C) inner core has a different composition than the outer core, with a lower melting point.
D) temperature is lower in the inner core than in the surrounding region.

Correct Answer:

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