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Unformatted text preview: birds; extinction of the dinosaurs; first hominids; first hominids with tools; earliest homo sapiens. 8. What is a mass extinction? What roll do they have in the development of the Geologic Timescale? 9. When did the second largest mass extinction in the fossil record occur? 10. What major animal group went extinct at that time? 11. What is the probable cause of that mass extinction? What is the evidence for that cause? 12. When was the largest mass extinction in the fossil record? 13. What is absolute geologic time? 14. Define the following: radioactive decay; atom; isotope; atomic number; atomic mass number....
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- Fall '08