Across
- 2. What most expensive jewelry is made of
- 3. The material pennies are made of
- 5. kind of air that some balloons have inside
- 8. a very strong light metal
- 10. only used in research at the moment
- 13. our body needs this
- 14. element used in batteries
- 16. what humans breathe
- 17. used for cancer therapy
- 18. material used for thermometers
- 19. material foil wrap is made of
Down
- 1. used in laundry and pools as a cleaner
- 4. a kind of rubber
- 6. used in drilling fluids for oil and gas wells
- 7. used in car batteries
- 9. material in which regular jewelry is made of
- 11. used to make pigments for ceramics
- 12. the third most abundant medal on earth
- 14. a bright color
- 15. is a food seasoning usually to make food salty