Across
- 4. The animal that hunts other animals
- 5. A tiny particle made of atoms
- 8. A process where liquid changes into gas
- 11. Breaking down of rocks over time
- 13. An animal that is hunted by another
- 14. The smallest unit of life
- 15. A force that resists motion between surfaces
- 16. A combination of two or more substances
- 17. The amount of matter in an object
- 18. How tightly packed matter is
Down
- 1. The usual weather of a region over time
- 2. The smallest unit of matter
- 3. The change of living things to survive their environment
- 6. A substance made of one type of atom
- 7. All living and nonliving things in an area
- 9. Anything that has life
- 10. A force that attracts iron or steel
- 12. A guess that can be tested in science
- 15. A push or a pull