k, c, q, ck, x, ch

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Across
  1. 3. to fall over, cave in or totally crumble
  2. 5. a series of events that happen repeatedly in the same order
  3. 7. actually
  4. 10. invisible line which splits the earth in half
  5. 12. the act of submitting
  6. 15. how much
  7. 16. crash together
  8. 18. a role
Down
  1. 1. storage container which holds water for sea creatures
  2. 2. to lower in value
  3. 4. rhymes with locket
  4. 6. very good, high quality
  5. 8. unfortunate
  6. 9. make a loud piercing sound
  7. 11. lacking noise
  8. 13. not included
  9. 14. one thousand grams
  10. 17. repetition of sound
  11. 19. an offensive move