| 1) | Why are mass extinctions important events in earth's history? |
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| 2) | Name two groups which died off at the Cretaceous-Tertiary boundary |
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| 3) | List two controls on phytoplankton productivity in the earth's oceans |
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| | A) What events could trigger a decrease in phytoplankton productivity? |
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| 4) | Match the mass extinction with its result |
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A. Cambrian-Ordovician (510 MY)
B. Permian-Triassic (245 MY)
C. Triassic-Jurassic (208 MY)
D. Cretaceous-Tertiary (65 MY)
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1. ammonites become extinct
2. 2/3 of existing trilobites extinct
3. radiation by dinosaurs
4. 90% of fossil life forms become extinct
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| 5) | How can sea floor spreading rates affect sea level? |
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