Multiple choice Which of these things helped to prove the Alvarez team's hypothesis? The Monongalia Crater The Cretaceous Crater The Jurassic Crater The Chicxulube Crater Reveal answer Fill a bubble to check yourself D Correct answer Explanation The discovery of the Chicxulub Crater in Mexico provided the crucial physical evidence of a massive asteroid impact dating to the boundary of the Cretaceous period, supporting the Alvarez hypothesis.