Locked in time

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Across
  1. 4. an inner feeling or voice
  2. 5. without conscious thought
  3. 7. fledged completely developed or established
  4. 9. operate at the same time
  5. 10. a nation bordered by China and Russia
  6. 12. the way in which two or more things have an effect on each other
  7. 15. make more noticeable or prominent
  8. 18. a large scale systematic plan
  9. 20. in a way that involves detailed knowledge
  10. 21. shining brightly
Down
  1. 1. mix or mingle together
  2. 2. not disputed or questioned
  3. 3. in a way that has a particular meaning
  4. 6. iron a form of iron
  5. 8. move or cause to move rapidly around
  6. 9. occasionally or irregular intervals
  7. 11. continuing for a long time or longer than usual
  8. 13. a detachable lock
  9. 14. an evergreen shrub
  10. 16. associate with
  11. 17. southeastern U.S state
  12. 19. worn by long exposure to air