engineering scavenger hunt

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Across
  1. 3. Mass production
  2. 6. Computer science
  3. 8. life
  4. 13. Human water resources
  5. 17. Testing mechanisms
  6. 18. Military engineering
  7. 20. Natureandenergy
  8. 21. conduction
Down
  1. 1. Transportation
  2. 2. land
  3. 4. force and motion
  4. 5. Gardening and plants
  5. 7. technology
  6. 9. Electronic testing (air conditioning etc.,)
  7. 10. Ocean environment protection
  8. 11. evidence
  9. 12. math
  10. 14. Deformation measurement
  11. 15. reactions
  12. 16. coding
  13. 19. Nuclear equipment