Renewable Energy

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Across
  1. 4. the total amount of organisms in a given area.
  2. 7. a company authorized to act as a single entity.
  3. 8. the ability to do something or produce something without waste.
  4. 9. energy produced by the internal heat of the earth.
  5. 11. money that can be offset against a liability.
  6. 12. natural movement of air along the ground.
Down
  1. 1. clean energy produced by shifting water in ocean tides.
  2. 2. of or relating to the sun.
  3. 3. a substance which expands freely to fill any space available.
  4. 5. a thing that motivates or encourages one to do something.
  5. 6. denoting the generation of power using flowing water.
  6. 10. a system of garbage and trash disposal in which waste is buried between layers of earth.
  7. 11. a tax or duty to be paid on a particular class of imports or exports.