Across
- 2. Main source of water on Earth’s surface
- 5. Process by which plants make their food using sunlight
- 9. Energy obtained from the sun
- 10. Cutting down of trees on a large scale
- 12. Planting trees to restore forest cover
- 14. The variety of plants and animals in an area
- 16. Rain that contains harmful acids due to pollution
Down
- 1. Reuse of waste materials to make new products
- 3. Pollution caused by excessive sound
- 4. Waste that does not decompose easily
- 6. Natural home of plants and animals
- 7. Fuel formed from dead plants and animals over millions of years
- 8. The gradual increase in Earth's temperature
- 11. The gas most responsible for global warming
- 13. Animals that are at risk of extinction
- 15. The layer that protects Earth from harmful UV rays