What evidence do we have that an impact played a role in the extinction of the dinosaurs?
A) The dinosaurs, as well as large numbers of other animals and plants, disappeared rather suddenly.
B) There is iridium (rare on Earth, but abundant in meteors) and soot (evidence of widespread fires) in a layer of clay laid down 65 million years ago.
C) Astronomers have found evidence for a 65-million-year-old impact crater in the Yucatán.
D) All of these choices are correct.
Correct Answer:
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