Another general knowledge crossword

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Across
  1. 4. Knock (someone) to the ground, esp. with a punch
  2. 6. A natural or established process by which something takes place or is brought about
  3. 8. asking politely or formally for something
  4. 10. atmosphere of a place
  5. 13. english county, famous for Stonehenge
  6. 16. clay like substance that is the chief source of aluminium
  7. 17. fine cotton fabric
  8. 19. dagger, formerly worn by Scottish highlanders
  9. 21. A journey for pleasure in which several different places are visited
  10. 22. gundog breed with a long silky coat and drooping ears
Down
  1. 1. father or mother
  2. 2. hard, whitish tissue making up the skeleton
  3. 3. Able to resume its normal shape spontaneously after contraction, dilatation, or distortion
  4. 5. the 34th president of the United States of America
  5. 7. European country, capital Sofia, pop. approx 7.4m
  6. 9. a small metal instrument specially cut to fit into a lock
  7. 11. a root vegetable related to the carrot
  8. 12. Bring (a task or activity) to an end
  9. 14. A wild cat with yellowish-brown fur, a short tail, and tufted ears
  10. 15. clearly and in detail, leaving no room for confusion or doubt
  11. 18. Having an acid taste like lemon or vinegar
  12. 20. small, usually furry, domesticated, and carnivorous mammal