What term describes the dense sphere of solid iron and nickel at Earth's center?

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Multiple Choice

What term describes the dense sphere of solid iron and nickel at Earth's center?

Explanation:
Earth’s center contains two distinct core regions, with the solid ball at the very center being the inner core. This inner core is a dense sphere made mainly of iron and some nickel, and it stays solid because the immense pressures at Earth's center keep iron in a solid state even though temperatures there are extremely high. Surrounding it is the outer core, which is molten iron-nickel that can flow and generate Earth's magnetic field. So the dense, solid sphere at the center is the inner core.

Earth’s center contains two distinct core regions, with the solid ball at the very center being the inner core. This inner core is a dense sphere made mainly of iron and some nickel, and it stays solid because the immense pressures at Earth's center keep iron in a solid state even though temperatures there are extremely high. Surrounding it is the outer core, which is molten iron-nickel that can flow and generate Earth's magnetic field. So the dense, solid sphere at the center is the inner core.

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