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Actually the earth's core isn't simply 1 thing. Chemically, the Earth can be divided into the crust, mantle, outer core, and inner core. By comparing material strength, the layering of the earth is categorized as lithosphere, asthenosphere, upper mantle, lower mantle, outer core, and the inner core.

Scientists base their predictions mostly on the density of materials, and how materials would react on the eart's gravity, and sometimes based on seismic activity.

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