Across
- 2. Biogas typically refers to a gas produced by the biological breakdown of organic matter in the absence of oxygen
- 3. A fuel derived directly from living matter
- 4. produced by the internal heat of the earth
- 7. The perceptible natural movement of the air
- 9. Move one's hand to and fro in greeting or as a signal
- 10. a vegetable oil- or animal fat-based diesel fuel consisting of long-chain alkyl
- 12. is a family of rechargeable battery
- 16. A cell producing an electric current directly from a chemical reaction
- 18. (Concentrated solar power) systems use mirrors or lenses to concentrate a large area of sunligh
- 19. determined by the sun
Down
- 1. is the process of producing coal gas
- 2. The total quantity or weight of organisms in a given area or volume
- 5. colorless, odorless, highly flammable gas
- 6. produced by burning carbon and organic compounds
- 8. powered by the energy released in nuclear fission or fusion.
- 11. transparent, odorless, tasteless liquid that forms the seas
- 13. electricity produced by water power
- 14. a form of hydropower that converts the energy of tides into electricity
- 15. delivers electricity from suppliers to consumers using digital technology with two-way communications to control appliances
- 17. (Liquefied petroleum gas)A mixture of light gaseous hydrocarbons