Across
- 2. 10% of human mass made out of
- 4. is about 18% of our body
- 6. is highly reactive
- 7. can be used for scuba diving
- 10. latin word flint-siex
- 13. twice as strong as Aluminium
- 14. also known as limestone
- 15. is used for fireworks
- 18. is toxic
- 19. 78.1% of the air
- 22. can be found in the earth vrust
- 24. isolated in the 18th century
- 25. greek word "" means new
Down
- 1. selene means moon
- 3. first metal to be worked by man
- 5. makes 8.2% of earth crust
- 8. does not occur free in nature
- 9. only 25% of the coin nickel is actually
- 11. is harder than steel
- 12. 100% percent recycble
- 15. makes up 3% of earth crust
- 16. makes up 2% of the earth crust
- 17. burn with a bright red color
- 20. it is odorless
- 21. it is yellowish
- 23. is the main component of meteorites