1
2
3
4
5
6
7
Across
- 5. The bending of light as it passes from one material to another
- 7. How tightly packed the matter is in something
Down
- 1. How hot or cold something is
- 2. The process of getting bigger or more developed
- 3. The smallest piece of matter that makes up everything
- 4. A glass container used in science experiments
- 6. The amount of matter in an object