Across
- 4. a way of getting food
- 6. what you get from photosynthesis
- 7. = mass divided volume
- 8. a matirial that alows sound waves to pass throu
- 9. a place with no particles of air
- 12. tha line in the middle
- 13. a shaking movement
Down
- 1. you can't see throu it
- 2. how heavy a thing is
- 3. what you see in the mirror
- 5. an object that alows only some light throu
- 10. the thing that the light rays bounces of
- 11. a thing that falls from the sky
- 13. the area cm3
- 14. the difference between high and low sound