Across
- 3. when the leaves change colors
- 7. formation of a new substance is a sign of _____
- 12. colorful display on 4th of July
- 13. tube of glowing color
- 14. extraction of minerals
- 15. to keep, preserve
- 17. chemicals combine wih metal in rocks forming _____
- 18. to uncover
- 19. the process of a solid to a liquid
Down
- 1. melting ice is an example of ______
- 2. a mixture of chemicals
- 4. used to time a reaction
- 5. made up of many sugar molecules surrounded by molecules of water
- 6. cutting the grass cannot be ______
- 7. solid to liquid, liquid to gas
- 8. sugar crystals dissolve because they are _____ in water
- 9. used to retrieve metals
- 10. the process of a liquid to a gas
- 11. a scientist muppet
- 16. something with a definite shape and volume