C. The United States
Earth's Core
- Earth's interior is layered like an onion.
- The solid iron-nickel inner core — today 1,200 kilometers (745 miles) in radius, or about three-quarters the size of the moon — is surrounded by a fluid outer core of molten iron and nickel about 2,400 kilometers (1,500 miles) thick.
- The core holds a much bigger stash of radioactive material than anyone had suspected, and its decay is giving off heat.
It is said that the Earth's core is about the size of the United states.
Thus, the correct option is C.
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