Earth's compositional layers, starting from the center, are the inner core, outer core, mantle, and crust. The inner core is solid and composed mainly of iron and nickel, while the outer core is liquid and also primarily made of iron and nickel. The mantle, which is semi-solid and much thicker than the outer layers, consists of silicate rocks. Finally, the crust is the thin, outermost layer composed of various rocks and minerals.
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