The Internal Structure of Earth Is a

The internal structure of Earth is a

A) core of solid rock extensively enriched in iron, surrounded by a solid mantle of pure rock.
B) large, solid iron core surrounded by a thick, flexible mantle of rock.
C) core of rock and iron, surrounded by a mantle of liquid hydrogen.
D) large core of iron, partly solid and partly molten, surrounded by a thick, flexible mantle of rock.

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