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The Last Extinction
Watch the Nova show on line and complete the worksheet you were given in class. If you lost the worksheet, cut and paste this text on to a word document for completion:
The Last Extinction- Nova March 2009
Define the term MEGAFAUNA:
How long ago was the extinction of the North American megafauna?
List at least FOUR organisms that went extinct at this time.
What was the climate of N. America like just before this extinction?
State the two current theories of why this extinction occurred and list at least three supporting pieces of evidence for each.
______________________________________________________________________
Theory 1:
Supporting evidence and where it is found:
A.
B.
C.
________________________________________________________________________
Theory 2:
Supporting evidence and where it is found:
A.
B.
C.
Explain why researchers went to Greenland and what information they hoped to find (and where they got it from)
What is the importance of Iridium (where does it come from)?
What other extinction theory is supported by the presence of Iridium?
Give one example of a recent human-caused extinction.
What evidence of large forest fires is found in the Greenland ice?
What evidence of an impact is found in the spherules that were in the ice?
Explain why there may not be an impact crater to find even if there was an extra-terrestrial impact. |
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RED KNIGHT TEAM Grade 8
Exeter-West Greenwich Junior High School
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