Why does the abundance of iridium suggest that the iridium came from an impact?
A. Iridium is rare on Earth's surface but common in meteorites that have impacted the Earth.
B. Iridium forms in forest fires, which were presumably ignited by the impact.
C. Iridium can only be made under the high-pressure conditions of an impact.
D. Iridium does not exist on Earth, so it must have come from space.
Answer: A. Iridium is rare on Earth's surface but common in meteorites that have impacted the Earth.
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