Across
- 2. natural fuel
- 5. not able to use again
- 8. preventing waste use
- 11. able to use again
- 12. to use it for somehting else
- 14. affects earth
Down
- 1. to use again
- 3. the total mass of organisms in a given area or volume.
- 4. sun energy
- 6. use of nuclear reactions to produce electricity.
- 7. earth heat
- 9. water power
- 10. cut down on ammount used
- 13. turbine energy