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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Answer: The American criminal justice system holds almost 2.3 million people in 1,833 state prisons, 110 federal prisons, 1,772 juvenile correctional facilities, 3,134 local jails, 218 immigration detention facilities, and 80 Indian Country jails as well as in military prisons, civil commitment centers, state psychiatric 
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