Across
- 4. There is 78% of this in air
- 5. Plants use this for photosynthesis
- 7. Without air there is no ......
- 9. Air carries this and it makes you sneeze
- 10. You can't see air, so it is ......
- 12. There is no air here
- 15. Air protects the earth like one of these
- 16. Air is this in a ball or tyre
Down
- 1. Humans, plants and animals breathe this
- 2. When air is this, it expands and goes up
- 3. There is a small quanity of this in air
- 6. The gas humans, plants and animals breathe
- 7. Air fills everywhere and can change .....
- 8. This is moving air
- 11. The atmosphere has different ones
- 13. Air can push and exert ....
- 14. Air has a weight or .......