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                      The inner core

                      The Inner Core is in the very middle of the Earth. The Inner Core is a solid sphere made up of both iron and nickel. It is almost a whopping 3,500 km below the surface of the Crust. The Inner Core is 1,207 km in diameter. The temperature is 7,200℃.
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                      Photo used under Creative Commons from ColleenSullivan93
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