Answer: inner core
The inner core is the deepest and hottest layer of the Earth. It is made almost entirely of metal—mostly iron and, while extremely hot (9,000-13,000 degrees Fahrenheit--or 5,000-7,000 C), it is solid. It's almost 750 miles thick! Next the outer core is made mostly of iron and nickel.
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Yes
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I don't think I have any explanation
