Impossible puzzle

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Across
  1. 4. ?
  2. 7. directions
  3. 9. cape of storms
  4. 10. speedy journey
Down
  1. 1. 1451
  2. 2. expensive jewels
  3. 3. trading
  4. 5. latitude longitude
  5. 6. latitude water
  6. 8. triangle