Across
- 4. the world of living organisms
- 5. narrow zone where land, water and the air interacts
- 7. the lard top layer of the earth
- 9. Our surroundings
Down
- 1. The domain of water
- 2. the blanket of air that surrounds the earth.
- 3. the system formed by interaction of living organism with each other
- 6. The world of non-living elements
- 8. with physical and chemical factors