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Mass Extinctions

Discovery Channel Video Clips
Mass Extinctions

This activity contains 6 questions.

Question 1
1 Most scientists support the hypothesis that the Cretaceous mass extinction was caused by _____.
End of Question 1

Question 2
2 Why were the scientists in the video studying fossil leaves?
End of Question 2

Question 3
3 What evidence do scientists use to support the meteorite impact hypothesis?
End of Question 3

Question 4
4 Why do scientists think that the iridium layer is evidence of meteorite impact?
End of Question 4

Question 5
5 Scientists believe that a meteorite struck _____, leading to the extinction of dinosaurs.
End of Question 5

Question 6
6 How long ago did the dinosaurs go extinct?
End of Question 6

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