Across
- 4. production of electricity from water
- 9. resources that cannot be replaced
- 10. decayed plant or animal matter
- 11. spread of desertlike conditions
- 12. resources formed from remains of ancient plants
- 13. a place where a plant or animal lives
Down
- 1. any material in nature that people use
- 2. surroundings
- 3. clearing of trees
- 5. a group of plants and animals that depend on each other for survival
- 6. resources Earth replaces naturally
- 7. to die out
- 8. planting trees to replace lost forestland