The Geologic Time Scale

1234567891011
Across
  1. 1. the parts of an era
  2. 4. an animal with a backbone
  3. 7. a warm blooded vertebrate that gives live birth
  4. 8. a time in which many species go extinct at the same time
  5. 10. the last era
  6. 11. scaly skin and lay tough leathery eggs
Down
  1. 1. the first era
  2. 2. animals without backbones
  3. 3. the three long units between Precambrian time and the present
  4. 5. lives in water and on land
  5. 6. the period of the humans
  6. 7. the middle era; time of the dinosaurs
  7. 9. the time of T-Rex