Root words

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Across
  1. 2. Signature
  2. 4. Tool for looking at small things
  3. 7. Underwater vessel
  4. 10. Device for seeing far away
Down
  1. 1. Ten years
  2. 3. Math involving shapes
  3. 5. To go back
  4. 6. To see ahead
  5. 8. Opposite of happy
  6. 9. The study of life