Stiffness -the state of being hard

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Across
  1. 4. dark,dirty,or cloudy
  2. 5. Cut or sense something open
  3. 6. Is very strong force
  4. 8. The state of being hard
  5. 10. To grind or crush something
  6. 11. Small streams or rivers
  7. 13. smaller,fewer,or less
  8. 15. A black carbon some substance made by wood
  9. 16. closed in or covered
Down
  1. 1. A gentle push,moving something slowly
  2. 2. A long chain of mountains or hills
  3. 3. The sharp , hollow strips of a porcupine
  4. 7. torn,ragged pieces
  5. 9. To remove or tear
  6. 12. A slow movement of something
  7. 14. To keep food or beverages cold