Across
- 2. changes in the shape of moon
- 6. The first artificial satellite sent by India in 1975
- 8. Amount of water vapour present in the air
- 9. this gas present in air helps in burning
- 10. a disease caused by virus
- 12. a method of preserving food by heating it at a very high temperature
- 13. this layer is present in stratosphere and shield harmful UV rays
Down
- 1. a greenhouse gas
- 3. a process to clean water by keeping it still so that impurities in it settles down
- 4. diseases that can be transmitted to others through air, water or touch
- 5. this has 5 layers and it surrounds the earth
- 7. Iron deficiency disease
- 11. This gas constitute 78% of air