Alternative energy

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