Across
- 4. an element used to make 'chips' for computer circuit
- 7. change from liquid to solid
- 9. a gas with low density that is put n balloons
- 11. what we breath out
- 12. the chemical element of atomic number 13, a light silvery, grey metal
- 13. what we drink
- 14. change from liquid to solid
- 15. inside nucleus
- 16. outside the nucleus
- 18. a form of energy resulting from the existence of charged particles
- 19. a material through which electric currents can pass
Down
- 1. a solid non-metal in the form of shiny, purple crystals
- 2. Building blocks of life
- 3. sedimentary rock that consists of sand or quartz
- 5. the quality of being hot
- 6. a hard sedimentary rock
- 7. a process that involves a rearrangement of the molecule or ionic structure
- 8. change from liquid to gas
- 10. change from solid to liquid
- 17. what we breathe in