Crust, mantle, outer core, and inner core. Crust is the outermost and thinnest layer of Earth. Mantle is the middle layer that makes up over 82% of Earth's volume. Outer core is a liquid layer about 2,266 km thick composed of iron and nickel that lies above the Earth's solid inner core and below its mantle. Inner core is the Earth's innermost part and is a primarily solid ball with a radius of about 1,220 km, according to seismological studies.
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