ica26-nov2 - large extinction event that killed off 90% of...

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Class 30, ICA #26, November 2. There were 3 clicker questions. You get 1 mark for answering each question. I didn't count getting it right or not. The clicker questions count for a total of 3 points toward your course grade, so your points for the day = # of marks * (3/3). Clicker Question #1: Suppose there had been no major impacts in the last 65 million yeras. What might Earth be like today? A. Mammals would have evolved differently; humans might not be here. Clicker Question #2: 250 million years ago, there was another
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Unformatted text preview: large extinction event that killed off 90% of all species on Earth. Would you expect to find a crater? C. No - the crater would have eroded away by now. Clicker Question #3: If something like Tunguska happens every ~100 years, how come we haven't heard about it [in previous events, say 200 or 300 or 400 years ago]? C is the current best guess, though one could argue that A and B are possible answers....
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