The Astronomical Event That Is Now Thought to Have Occurred

question 98

Multiple Choice

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.

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