Geologic Time Scale

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Across
  1. 4. Eons may be divided into an ______
  2. 5. whose name means "middle life"
  3. 7. Each era is subdivided into a number of ________
  4. 9. The idea that Earth is an always-changing place
  5. 10. whose name means "ancient life"
  6. 12. whose name means "recent life"
Down
  1. 1. The Era at 195 to 65 million years ago
  2. 2. The time at 3.6 billion years ago
  3. 3. The Era at present day
  4. 6. The Era at 544 million years ago
  5. 8. The largest unit of time
  6. 11. The periods of the Cenozoic, the most resent era, ar further divided into an _______