Across
- 2. Prefix that means small
- 9. When a piece of matter heats up, its particles move
- 11. Another word for atoms and molecules
- 12. Change from one form to another
- 15. What causes all changes in the universe
- 16. Device that measures the temperature of matter
- 18. Anything that has weight and takes up space
Down
- 1. When a piece of matter cools down, its particles move
- 3. Variable a scientist keeps the same on purpose
- 4. Variable a scientist changes on purpose
- 5. Energy of warmth
- 6. Measured with a scale, often called weight
- 7. Variable a scientist observes to see if it changes
- 8. How much space something takes up
- 10. Move from one place to another
- 13. Energy of movement
- 14. Prefix that means living
- 17. Scientific tool used to observe very small things