How were there so many data points on the graph of frequency of different types of asteroid collisions? Were there really that many mass extinction ones?
I think that on this plot the points are not actual data points; rather, the scatter of points represents uncertainty (your text in Figure 12.25 summarizes the same plot as a line). Yes, there is evidence from craters of many large, infrequent impacts in the past. There is also evidence for mass extinctions every few hundred million years in the fossil record (although it’s not clear that every extinction was correlated with an impact).
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