The earths inner core is solid because of... A. its great diameter
B. extreme temperatures
C. the composition of its rock
D. Immense pressure

D. Immense pressure

Explanation:

The inner core is solid because it is made of very dense, or heavy, materials - like iron and nickel. Even though it is very hot, these materials don't "melt" very easily, so they stay solid. It turns out that many materials can be a solid at a higher temperature if the pressure is also higher.

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