Why is the Cenozoic era called the Age of Mammals?
3. Name the 2 periods in the Cenozoic Time frame. 4. When did humanity appear? Mesozoic Era 5. Name the 3 time periods in the Mesozoic Era. 6. What formed from a collision during this time? 7. What is the most dominant life form? Which is the most common? 8. Name 4 other life forms that appeared during this time. Paleozoic Era 9. Name what makes up the composition of the air. 10. List the most abundant life forms. 11. What caused the mass dying? Precambrian Era 12. Name the 3 eras. 13. Describe the Earth during the Hadean Era. 14. What cooled to form the ocean floor? 15. What was the only life form? 16. About how long ago did single-celled organisms with a nucleus form? Names on the Staircase of Time 17. What do groups of fossils show? 18. How were the time periods named? How Old is that Rock 19. Where are younger rocks found? 20. Define absolute age and how it is measured. 21. The older a rock, the _____ the number of ____ elements and the ______ the number of ______ elements are foun
