All the iron on Earth originated in large stars that existed before our Sun even formed. Iron is the final product of a star’s radioactive decay, which fuses hydrogen atoms to form ever heavier elements. When the hydrogen fuel is exhausted and sufficient mass accumulates in the core of the star, it no longer supports its own gravity, and explodes; or so I’m told. In that supernova explosion, huge chunks of iron can be thrown many light years into space. Such a chunk came to land in eastern Missouri’s St. Francois County and became Iron Mountain.
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