Across
- 5. A source in which can be renewed
- 6. Ice covering land for a long time
- 8. A layer of soil that never rises over the freezing point
- 10. What we humans breathe out
- 11. A gas that takes up 78% of the Earth's atmosphere
- 13. The act of clearing tree and forests
- 14. Fuel made of fossils
- 17. The cause of Global warming by greenhouse gases
- 20. The masses of land on Earth
- 22. All of life that is formed on Earth
- 23. The process of gas turning into liquid
- 26. The current condition of the atmosphere
- 27. The energy which comes from Sun
- 28. A extreme event that caused drought in parts of Australia
Down
- 1. Opposite of shortwave
- 2. The long term weather conditions
- 3. All the water on the Earth's surface
- 4. Formed from the breakdown of organic matters
- 7. The process in which liquid turns into gas
- 9. The process in which plants use to create their own food
- 12. The circulation of the ocean's flow caused by changes in the density
- 15. The time between glaciations
- 16. Fuel made of organic matters
- 18. The process of recycled Carbon
- 19. The radiation of a wave length from 800 nm to 1 mm
- 21. A system created by the interaction between organisms and their environment
- 24. The release of gas or radiation
- 25. The layer of gases that covers Earth