Across
- 5. The smallest building block of matter
- 6. The form matter can be in (solid, liquid, or gas)
- 8. A state of matter that spreads out to fill all the space
- 9. When a liquid turns into a solid
- 10. When a liquid turns into a gas
- 13. How tightly packed the matter is
- 15. A state of matter that flows and takes the shape of its container
Down
- 1. When a gas turns into a liquid
- 2. A tiny piece that makes up matter
- 3. How much matter is in something
- 4. When something becomes different
- 7. When a solid turns into a liquid
- 11. A feature you can observe or measure
- 12. What something is made of
- 14. A state of matter that keeps its shape