Across
- 1. matter that keeps its shape
- 4. to group objects by properties
- 6. a change that can be undone
- 8. to lower the temperature
- 9. matter that fills space
Down
- 2. a change that can not be undone
- 3. anything that has weight and takes up space
- 5. to raise the temperature
- 7. matter that takes the shape of its container