Content Frame
Note for screen reader users: There is text between the form elements on this page. To be sure that you do not miss any text, use item by item navigation methods, rather than tabbing from form element to form element

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


Clear Answers/Start Over





Pearson Copyright © 1995 - 2012 Pearson Education . All rights reserved. Pearson Benjamin Cummings is an imprint of Pearson .
Legal Notice | Privacy Policy | Permissions

[Return to the Top of this Page]