Across
- 3. Consists of all waters present in the Earth
- 8. Homogeneous mixture of gases on Earth
- 10. Highly poisonous gas with three atoms of oxygen
- 11. Introduction of pollutants to environment
- 12. Dark organic material in the soil
- 13. Falling of water from clouds to Earth in liquid or solid state
- 16. Example of bacteria in nitrogen-fixation
- 17. Another word for burning; exothermic redox
- 18. Organisms feeding on dead decaying matter
- 19. Movement of air
- 21. Gaseous envelope of a celestial body
- 22. Release of water from leaves of plants
- 23. Physical environment where organisms are inter-related
- 24. Production of energy in living organisms typically with inhale of O2 and exhale of CO2
Down
- 1. Uppermost soil layer with most organic matter
- 2. Glass structure to grow tender plants to protect them from weather, mostly cold weather
- 4. Change of state from liquid to gas
- 5. Second layer of atmosphere as you go upward
- 6. Breaking of dead matter into simpler form
- 7. Clearing or thinning of forests by humans
- 9. Process by which plants use sunlight, CO2 and water to make their food
- 14. Variety of life on Earth
- 15. Oxidation of ammonia to nitrites
- 20. Organism causing disease(s); germ
- 25. Fog intensified with smoke