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