Across
- 3. gas drilled to extract
- 4. to make it like new
- 6. DO NOT naturally renew or replenish themselves
- 9. energy from any material that comes from plants
- 10. energy made from flowing water
- 11. thick black liquid
- 12. gases a gas that contributes to greenhouse by effect by absorbing carbon dioxide
- 13. production of gas discharge or radiation
- 15. generated during nuclear fission
- 17. to use something again
- 18. produced by the natural rise and fall of tides
- 19. to convert waste into reusable material
- 21. naturally renew or replenish themselves
Down
- 1. careful maintenance and upkeep of a natural resource
- 2. nonrenewable and forms within the earth over millions of year
- 3. fossil fuels coal oil natural gas fracking and nuclear
- 5. captured with wind turbines
- 7. mineral formed from plants that have been fossilized
- 8. heat energy from deep within the earth
- 14. energy from the sun
- 16. wind solar geothermal hydroelectric tidal biomass
- 20. layer in earths stratosphere which absorbs most of ultraviolet radiation