Across
- 2. converting biomass into gas and liquid fuels
- 4. a series of pools built like steps to help fish pass a dam or waterfall
- 6. chemical compounds that contain carbon and hydrogen atoms
- 9. efforts made to reduce the amount of energy required to provide products and services
- 12. resources that can be replenished but over a long period of time
- 13. lights that last longer and are better for the environment
- 14. what oil is mainly used for
- 15. a substance that provides energy as a result of a chemical change
- 16. electricity produced by flowing water
- 19. when two hydrogen nuclei collide to make a helium nucleus which produces energy
- 22. light and heat given off by the Sun
- 25. used to harness the wind to power energy
- 26. lights that use gas in order to work
- 27. a mix of alcohol and gasoline that can be used to fuel cars
- 28. heat from the Earth's interior
Down
- 1. the most plentiful gas in the universe
- 3. separating the hydrogen from carbon into methane
- 5. wood, plant parts, manure, and food wastes that can be used as fuels
- 7. resources that can be replenished in a relatively short period of time
- 8. will produce methane, has to do with biomass
- 10. compounds that are made from oil such as plastic, paints, and other products
- 11. used to convert the Sun's rays into usable energy
- 13. adds yeast to biomass to produce ethanol
- 17. efforts made to reduce the consumption of energy
- 18. a factory where crude oil is heated and separated into fuels and other products
- 20. when hydrogen is split from water using an electric current
- 21. when an atom's nucleus splits into two smaller nuclei
- 23. large padding used as a barrier to trap heat, mostly found inside the walls of houses
- 24. pushes windmills or turbines to power electricity