Across
- 7. Mass cutting of trees
- 9. A symbiotic bacteria that lives in the root nodules of leguminous plants
- 10. A blanket of air that surrounds the Earth
- 12. Process by which nitrate turns into nitrogen in atmosphere
- 14. The product of photosynthesis
- 15. Water loss of plants in the form of water vapour
- 16. Cooling down of water vapour to form water droplets
- 17. Process by which non usable nitrogen is turned into usable nitrogen
- 19. A natural process that heats the Earth's surface
Down
- 1. Plants using CO2 to release glucose
- 2. Fuel is heated and reacts with oxygen to release energy
- 3. Formation of water vapour with the process of heating
- 4. The trapping of the Sun's warmth in Earth's atmosphere
- 5. Process by which nitrogen in atmosphere turns into nitrate
- 6. Displacement of the upper layer of soil
- 7. Degradation of animal or plant bodies
- 8. Intaking oxygen and releasing CO2
- 11. Process by which rain is formed
- 13. Converting dead plants into ammonia
- 18. A factor that contributes in pollution