Across
- 3. making electricity from organic objects
- 5. a solution for global warming
- 8. using earth heat to power machinery
- 9. created the earth
- 10. first man on earth
- 11. source of oxygen
- 12. water on the earth
- 13. the flow of air on earth
Down
- 1. sun power
- 2. a huge global problem right now
- 4. all trees and plants have it
- 6. first woman on earth
- 7. also a form of climate change