Across
- 5. A thick dirty cloud caused by pollutant
- 7. Higher air and sea temperature
- 8. The long period in which no rain
- 9. Process by which the land becomes desert
- 11. People or animals breathe out
- 13. Destruction of forest by people
- 14. Tree planting to recover destroyed forest
Down
- 1. Ability to decompose naturally, harmlessly
- 2. Rain that contains harmful chemicals
- 3. Contamination of environment
- 4. Releasing no greenhouse gas
- 6. Gas in the atmosphere contains heat
- 10. Large amount water covers an dry area
- 12. Sudden violent movement of earth's surface