Across
- 1. a device that holds things together
- 7. repeated
- 8. hit hard
- 12. small harmful particles
- 13. existence
- 15. operated by machines and computers
- 17. understanding of informatin
- 18. connection
Down
- 2. remove the bad things
- 3. not having enough of something
- 4. equipment
- 5. change in position
- 6. unable to react
- 9. inability to think clearly
- 10. related to breathing
- 11. can be thrown out after use
- 12. blocked
- 14. droplets of liquid in the air
- 16. machines that operate automatically or by computer