Across
- 4. The layer which protects us from UV rays
- 5. Biological agent which helps in detecting pollution
- 9. Land mass of the Earth
- 10. Non-absorbable nitrogen to absorbable nitrogen
- 11. Place where plants that need protection from cold weather are grown
- 12. Gas which is present in 0.03% in the atmosphere
- 13. Symbiotic bacteria involved in nitrogen fixation
Down
- 1. Gas Which is present in 21%in the atmosphere
- 2. Process in which oxygen is released
- 3. Life existing zone
- 6. Bacteria involved in nitrogen cycle
- 7. An envelope of gases surrounding the Earth
- 8. Water of the Earth
- 10. Gas Which is present in 78% in the atmosphere