Across
- 5. The process of planting trees to restore a forest (13 letters)
- 8. fuel A fuel formed from the remains of ancient plants and animals (9 letters)
Down
- 1. The type of energy derived from Earth's heat (11 letters)
- 2. A forest with high rainfall, usually near the equator (9 letters)
- 3. Warming A gradual increase in Earth's average temperature (12 letters)
- 4. cycle The movement of water through evaporation, condensation, and precipitation (10 letters)
- 6. The area where a river meets the sea (7 letters)
- 7. The variety of living organisms in a particular area (13 letters)