Across
- 2. the reason why we live
- 3. number 4 in periodic table
- 5. used in most of the acids
- 7. one of the main component of fertilisers
- 9. used in cars,ships,aircrafts
- 10. used in salt
- 12. in the air
- 14. also main component of fertilisers
- 16. base of the bones
- 17. in batteries
Down
- 1. in ballons
- 3. in eye drops
- 4. used to make swimming caps
- 6. used as radium
- 8. to keep water cool
- 9. also used as radium
- 11. no. 12
- 13. also recommended by doctors to take
- 15. released when mining
- 16. used in carbon fibre