Iridium is a component of cosmic dust that rains down upon the earth at a constant rate. Why did Luis Alvarez suggest measuring iridium levels in the K-T boundary?
A. He hypothesized that the layer was caused by a supernova explosion.
B. He was looking for a way to determine how quickly the layer had been deposited.
C. He hypothesized that the layer was caused by an asteroid impact.
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