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