Why Did Scientists FIRST Hypothesize That a Meteorite Impact Caused

question 56

Multiple Choice

Why did scientists FIRST hypothesize that a meteorite impact caused the extinction at the K-T boundary?

• A) They found evidence of a giant tsunami on the Gulf coast.
• B) They found evidence of an impact crater in Mexico.
• C) They found evidence of wildfires in many regions throughout the globe.
• D) They found evidence of iridium enrichments in a clay layer that led them to believe that the iridium was the remains of a meteorite impact.
• E) They found evidence of acid rain in the rocks in the Southern Hemisphere.

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