Across
- 1. Safe drinking water
- 3. Largest source of energy
- 6. Planting more trees
- 9. Cutting down forests
- 10. Third R after Reduce and Reuse
- 11. Dirty air caused by smoke and harmful gases
- 12. Layer of gases around Earth
Down
- 2. Plants and animals living together
- 4. Protected area for wild animals
- 5. Variety of plants and animals
- 7. Things in nature people use
- 8. Gas used by plants in photosynthesis