non conventional energy

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Across
  1. 3. Anaerobic respiration is the breakdown of organic matter by ____ in the absence of oxygen
  2. 4. cleanest form of renewable energy which produces no pollution
  3. 5. The residue left behind in the tank is rich in nutrients and can be used as __
  4. 7. Solar cells are also known as ___ cells.
  5. 8. Waste recycling and resources recovery program
  6. 9. Solar energy is a ___ source of energy.
  7. 11. Naturally occurring radioactive element
  8. 13. a number of windmills are installed in a definite pattern in clusters called
  9. 15. main source of solar energy
Down
  1. 1. the fourth largest source of electricity
  2. 2. ___ is composed of methane, carbon dioxide, hydrogen and Hydrogen sulphide
  3. 6. India is located on the Tropic of ____.
  4. 8. land owners can look for additional income by installing __ turbines on land that can even we used for agricultural purposes
  5. 10. ___is an inexpensive, reliable and non-polluting source of energy for generating electricity
  6. 12. One main type of nuclear reactor used to generate electricity is the ___ water.
  7. 14. Nuclear energy reduces the requirement of the amount of energy generated from?