Who knows ?

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Across
  1. 3. a journey
  2. 4. used to cut things
  3. 6. a fish that lives in cold waters
  4. 7. strong people have it
  5. 8. Annihilating some one
  6. 11. a part of a movie
  7. 13. pestering someone
  8. 14. moving stealthily
  9. 15. someone who ruins a party
Down
  1. 1. something that has consequences
  2. 2. a fake of something
  3. 5. a school subject
  4. 9. being happy
  5. 10. a competitor of apple
  6. 12. the opposite of running