Earth center {core, Earth} {Earth core} has been the same since 3,500,000,000 years ago, after heating and layering ceased.
Earth center {inner core, Earth} is solid iron with some nickel and cobalt. Inner core has pressure 20,000 tons/in^2, temperature 4000 F to 8000 F, and radius 800 miles.
Layer {F shell} above inner core is 300 miles thick.
Layer {outer core} above F shell is liquid iron with some nickel, cobalt, silicon, and sulfur. Outer core has pressure 10,000 tons/in^2 and is 1375 miles thick.
Layer {D shell} above outer core is several hundred miles thick.
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Date Modified: 2022.0225