Primary technology - HARD MATERIALS [General]

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Across
  1. 3. Keep yourself safe
  2. 6. Used for fixing two pieces of wood
  3. 8. A part of the timber
  4. 10. The main material used in woodwork
  5. 13. Will make you sick
  6. 14. For marking
  7. 15. Have more holding power than nail
  8. 16. Pay attention to
  9. 18. Makes the joint stronger
  10. 19. Everyone's responsibility
  11. 20. Any accident to the teacher
Down
  1. 1. Something that can harm us
  2. 2. Drives the nail to the timber
  3. 4. Do not run
  4. 5. Smoothen the surface of the wood
  5. 7. To be worn when using a Poker machine
  6. 9. For measuring
  7. 11. Is a type of finish
  8. 12. Remove the hazard
  9. 17. For marking squareness