Geologic Time Scale Crossword

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Across
  1. 2. animals with backbone
  2. 3. organisms fail to survive & completely die out
  3. 5. era where 1st land plants and fish appeared
  4. 6. era known as age of the dinosaurs
  5. 8. era we are living in now
  6. 10. period where flowering plants evolved
  7. 11. appeared during the Cenozoic era
  8. 12. period marked by appearance of first bird
  9. 13. era in which life first appeared
Down
  1. 1. model of the history of life on Earth
  2. 4. large impact space stone believed to cause extinction of dinosaurs
  3. 7. change of organisms over a long period of time
  4. 9. dominated the Mesozoic era