Scientists figure the earth's core to be mainly a heavy compressed lump of this metal

Please see below the Scientists figure the earth's core to be mainly a heavy compressed lump of this metal answer and solution. This clue is part of the Jeopardy Words Daily Challenge and was last seen on June 27 2020. The Jeopardy Daily Challenge is an addictive word puzzle game where you are given 4 clues every single day and you have to correctly find the answers.

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