Alvarez and his team hypothesized, and found evidence for, an asteroid impact that triggered a global extinction. Using this hypothesis, the scientific community explored other lines of evidence to support the theory including .

Past massive volcanic activity

Explanation:

This massive volcanic activity provides evidence that asteroid could have actually triggered a global extinction.

This is because scientists discovered a huge amount of surface area which they believe was altered by volcanic material.

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solution: read the introduction, the norm, or even explaination if you still dont get it.