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Across
  1. 2. These convert kinetic energy of wind into mechanical energy
  2. 4. This energy is a direct source of heat energy
  3. 5. Is not a renewable energy source
  4. 7. A fibrous material in which the dead plants change during the formation of coal
  5. 8. These are microscopic animals and plants
  6. 9. Batteries store this form of energy
Down
  1. 1. A structure that uses concentrated solar power to produce high temperatures
  2. 3. These are driven by turbines to generate electricity
  3. 4. A collection of solar cells
  4. 6. A device that converts the energy of light directly into electricity