Across
- 4. covert waste into reusable energy
- 5. produced by the internal heat of the earth.
- 7. the use of wind turbines to generate electricity
- 10. will run out
- 12. fuels a natural fuel such as coal or gas
- 13. the sun
- 14. the use of nuclear reactions to produce electricity
Down
- 1. will never run out
- 2. prevention of wasteful use of a resource.
- 3. something that has negative and harmful effects
- 6. denoting the generation of electricity using flowing water
- 8. to limit how much is used
- 9. to have multiple purposes for it
- 11. the total mass of organisms in a given area or volume.