This is an iron buoy. Where were its atoms formed?
in a high-mass star preceding Sun
in the Sun
in the Earth's core
in the Earth's crust
Radioactive nickel-56 (which decays to the most common isotope of iron) is the last element to be produced before the collapse of a supernova. That is why the iron was abundantly scattered into space after the supernova explosion.
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in a high-mass star preceding Sun
in the Sun
in the Earth's core
in the Earth's crust
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