Geological time

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Across
  1. 3. old rock
  2. 5. our planet
  3. 7. Earth's crust
  4. 9. number
  5. 10. Earth made of
Down
  1. 1. time when life began
  2. 2. clock
  3. 4. first recorded eon
  4. 6. relationship
  5. 8. ages ago