How many impact craters are there on Earth?
A) fewer than 200, all less than a few hundred million years old
B) only one very recent crater, about 25,000 years old, found in Arizona
C) thousands, their times of formation extending from present times to more than 3 billion years ago
D) about 20, the oldest of which became Chesapeake Bay and resulted in the extinction of the dinosaurs 65 million years ago
Correct Answer:
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