Geologic Time Scale

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Across
  1. 2. The epoch in which we currently live
  2. 4. Multicellular organism with a nucleus
  3. 7. The largest mass extinction that took place 251 million years ago
  4. 8. The first Eon
  5. 10. The earth is 4.6 ______ years old
  6. 11. Eons are divided into _____
  7. 13. Smallest division of time
  8. 15. The _________ era is after the Paleozoic Era
  9. 16. Rise of humans
  10. 18. The extinction of many species at the same time
  11. 20. In the beginning of time, there was no ________
Down
  1. 1. 65 million years ago to today
  2. 3. 90% of _______ life died during the Permian Extinction
  3. 5. Single cell organism with no nucleus
  4. 6. Mass Extinction 65 million years ago
  5. 9. Rise of mammals and birds
  6. 12. During the ________ era, new life forms appeared
  7. 14. The death of every member of a species
  8. 17. The Jurassic ______
  9. 19. Largest division of time