natural resources
Across
- 5. formation of organic nitrogen from inorganic compounds
- 7. non-living components of nature
- 8. process that makes fossil fuels release carbon dioxide
- 14. gas present in 78% of the atmosphere
- 15. release of water vapour by plants
- 17. gases that are known for the greenhouse effect
Down
- 1. change from liquid to vapour state
- 2. displacement of soil
- 3. energy transfer from the Sun to the earth
- 4. degradation into organic substances
- 6. layer of gas surrounding the earth
- 9. gas composed of three oxygen atoms
- 10. gas present in 21% of the atmosphere
- 11. process which leads to rain, hail, snow, etc.
- 12. contamination
- 13. all water bodies collectively is known as
- 16. life-sustaining process of intake and release of oxygen