What hypothesis did Luis and Walter Alvarez test in relation to the mass extinction of dinosaurs 65 million years ago (MYA)?
A)The mass extinction 65 MYA was caused by a surge of catastrophic cyclones.
B)The mass extinction 65 MYA was caused by a slow but steady increase in climate temperatures.
C)The mass extinction 65 MYA was caused by an impact of an extraterrestrial object.
D)The mass extinction 65 MYA was caused by the loss of preferred plants for food.

Question

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Luis and Walter Alvarez tested the hypothesis that the mass extinction of dinosaurs 65 MYA was caused by an impact of an extraterrestrial object. They found evidence of a layer of iridium in sedimentary rocks from that time period, which is a rare element on Earth but common in asteroids and comets. This led them to propose the theory that a large asteroid or comet impact caused environmental changes that contributed to the mass extinction. This is now known as the Alvarez hypothesis or the impact theory of extinction.

What Hypothesis Did Luis and Walter Alvarez Test in Relation