Geologic Time Scale Cross word puzzle

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Across
  1. 4. time it takes to decay
  2. 7. exact age in years
  3. 10. rock within another is older
Down
  1. 1. younger than what it cuts
  2. 2. tracking of radioactive isotope decay
  3. 3. assumption;new on top and old on bottom
  4. 5. oldest=bottom youngest=top
  5. 6. same fossil in different area
  6. 8. Estimated age
  7. 9. dead organic matter that's now rock