Nuclear deterrent

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Across
  1. 2. Stof fine, dry particles of matter
  2. 5. Totally
  3. 6. One that succeeds another
  4. 8. A vessel that can be submerged and navigated under water
  5. 10. Destroy
  6. 11. Ability
  7. 12. A period of 10 years
  8. 15. He condition or fact of being established.
  9. 18. Free of deceit
  10. 19. An organization, company, or bureau that provides some service for another
Down
  1. 1. Necessary to the continuation of life
  2. 3. Something that deters
  3. 4. Matter
  4. 7. One who precedes another in time, especially in holding an office or position.
  5. 9. Measure
  6. 10. To oppose or resist with boldness and assurance
  7. 13. Study of shooting with bullets
  8. 14. Capable of being split or divided
  9. 16. A rocket
  10. 17. To make smaller or less or to cause to appear so