Across
- 4. The process of gas cooling into a liquid
- 6. A force that slows motion surfaces rub together
- 8. Anything that has mass and takes up space
- 10. A factor that can change in an experiment
- 12. A testable educated guess
- 14. Combination of different substances
- 15. The smallest unit of matter
- 16. A group of atoms bonded together
Down
- 1. To reuse materials
- 2. The amount of mass in a given volume
- 3. a push or pull on an object
- 5. The layer of gases around the earth
- 7. A force that pulls objects to the earth
- 9. The process of water changing into a gas
- 11. The amount of matter in an object
- 13. A type of matter with specific properties