The Outer Core of Earth Is Molten, but the Inner

question 28

Multiple Choice

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

• A) inner core has a different composition than the outer core, with a higher melting point.
• B) lower pressure in the inner core allows the material to freeze out of the molten rock.
• C) melting point of the iron-nickel mixture is raised above the actual temperature by the extremely high pressure.
• D) temperature is lower in the inner core than in the surrounding region.

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