I would assume heavier molten metals would be in the center of the earth. Is it possible that the center has different molten metals on top of each other with a high concentration of iron on the outside of the core?
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There is a lot of gold and platinum and other heavy rare metals in the core, too. In fact, all the heavy metals that were on the earth when it first formed are there. The gold we can find now was deposited on earth later. A lot came from when a mars-sized planetoid crashed into earth and blasted a bunch of material off, some of which formed the moon. More was deposited by other meteors. In those days there were a lot more rocks flying around so there were a lot more impacts.
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