The astronomical event that is now thought to have occurred some 65 million years ago,resulting in the death of a large fraction of all living species and leaving a layer of clay containing an enhanced concentration of a rare metal,iridium,in the geological record in rocks throughout the EarthEarth was a(n) :
A) extraordinary solar eruption or flare.
B) very large volcanic eruption on the EarthEarth.
C) supernova that exploded relatively close to the solar system.
D) asteroid impact on Earth.
Correct Answer:
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