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Outer Core solid metallic alloy

Arguments for light element determination mainly follows from considerations on:

For details, see Jeanloz, 1990, Annu. Rev. Earth Planet. Sci., 18, 357-386.

Inner Core solid cristallyed Fe-Ni alloy

Temperature:

CMB, core side: mush zone

O, Si, Mg intermixed within iron-alloy fluid core-mantle reaction in mush zone
=> composition of core increasingly contaminated by mantle (O most important)