Sources of energy

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Across
  1. 4. A piece of equipment, usually kept on a roof, that collects and uses the sun's energy to heat water or make electricity
  2. 6. The gradual warming of the air surrounding the Earth as a result of heat being trapped by pollution
  3. 8. The physical and mental strength that makes you able to do things
  4. 9. The thick, dark liquid from under the ground from which petrol is produced
  5. 10. ... (adj.) energy replaces itself naturally
Down
  1. 1. The kind of energy that is produced when the nucleus of an atom is either split or joined with the nucleus of another atom
  2. 2. The process of making air, water, soil etc dangerously dirty and not suitable for people to use
  3. 3. The air, water, and land on Earth, which can be harmed by man's activities
  4. 5. A clear substance like air that is burned for heating or cooking
  5. 6. Coming from the heat inside the earth (adj.)
  6. 7. Environmentalists would like to see ... fuels replaced by renewable energy sources.
  7. 11. Moving air, especially when it moves strongly or quickly in a current