geologic time scale

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Across
  1. 4. the time period where plants appear
  2. 5. the time era where flowering plants appear
  3. 8. the time era where humans appear
  4. 10. the time period where dinosaurs appear
Down
  1. 1. the time era where mammals appear
  2. 2. the time era where turtles, crocodiles, and dinosaurs appear
  3. 3. the time period where modern humans appear
  4. 6. hundreds of millions of years
  5. 7. the time era where apes appear
  6. 9. One billion years