The cool thing is that we still don't know the cause of all the mass extinctions in the Earth's history, just for lack of evidence. Dinosaurs were probably either a meteor or a volcano, but that's just one out of the five extinctions we had. I've watched professors argue about it to the degree that one of them mentioned afterwards that there should be a mandatory retirement age, it's the funniest shit when you're an undergrad who doesn't know enough to have an opinion.