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