Across
- 2. two things collide it creates a ......
- 4. emission of energy
- 8. layer of atmosphere closest to earth
- 9. Regions of a planet which organisms live
- 10. protects earth for UV-A B & C
Down
- 1. atomic number of 6
- 3. No colour no smell gas
- 5. radiation which causes sunburn
- 6. current
- 7. surrounds earth