Impossible

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Across
  1. 2. Change made at the line of scrimmage
  2. 5. Machine that keeps a lawn under control
  3. 6. Stocky dog with a wrinkled face
  4. 8. Six-point football score
  5. 11. Artificial supply of water to crops
  6. 16. Puzzle made from intersecting answers
  7. 18. Outdoor labor that somehow never stays finished
  8. 21. Tool used to open compacted soil
  9. 25. British leader often associated with a bulldog
  10. 27. Professional who shapes young minds
  11. 28. Place where learning and controlled chaos coexist
  12. 29. Ford SUV—or a person seeking adventure
  13. 30. Edge of something—or a familiar surname
  14. 32. Home of the Volunteers
  15. 33. Backfield position essential to the Wing-T
  16. 34. Warm-season grass that spreads slowly
  17. 36. Custom passed from one generation to another
  18. 37. Study of the past
  19. 39. School leader—or the original amount of a loan
Down
  1. 1. Method used to measure learning
  2. 3. Durham mascot and a popular football formation
  3. 4. Leader who develops players
  4. 7. Collection of a team's strategies
  5. 9. Side of the ball tasked with stopping scores
  6. 10. Ability to guide and influence others
  7. 12. Exciting experience involving discovery
  8. 13. Practice player—or a famous defensive tradition
  9. 14. Bird of prey with Atlanta ties
  10. 15. Something valuable waiting to be found
  11. 17. School connected to the Wildcats
  12. 19. Academic challenge at the proper level
  13. 20. Shared customs and traditions of a group
  14. 21. Home of the Falcons
  15. 22. Pregame gathering involving food and football
  16. 23. Study of places and people
  17. 24. One who gives time—or cheers in Knoxville
  18. 26. People connected by place or shared identity
  19. 31. Process that removes salt from water
  20. 35. Position in a classic misdirection offense
  21. 38. Another name for a football field