Across
- 4. , The ways by which water from clouds come down to earth
- 6. , a tri-atomic form of oxygen
- 8. , The gas present in largest quantity in atmospere
- 10. , A phenomenon caused by excess CO2 in the environment raising earths temperature.
- 11. , A source of fresh water that starts in the mountains and finishes in the ocean.
Down
- 1. , frozen rivers of water found in mountains and polar region
- 2. , The pollution of lakes and ponds because of algal bloom caused by excessive fertilizers.
- 3. , Layer of air surrounding the earth
- 5. , The largest reservoir of water on earth
- 7. , This type of natural resource replenishes itself naturally and does not get used up.
- 9. , A mixture of smoke with fog