differentiated protoplanet could have been as fast as 1000 years or as slow as 300,000 years (depending on viscosity of both cores).

Chemistry

Determining primary composition - Earth

Using the chondritic reference model and combining known compositions of the crust and mantle, the unknown component, the composition of the inner and outer core, can be determined: 85% Fe, 5% Ni, 0.9% Cr, 0.25% Co,

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