Sources of Energy

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Across
  1. 4. a place, person or thing that you get something from
  2. 7. a system for carrying people or goods from one place to another using vehicles, roads, etc.
  3. 9. of or connected with the sun
  4. 11. replaced naturally or controlled carefully and can therefore be used without the risk of using it all up
  5. 12. a form of energy from charged elementary particles, usually supplied as electric current through cables, wires, etc. for lighting, heating, driving machines, etc.
Down
  1. 1. available or existing in large amounts or numbers
  2. 2. cannot be replaced after use
  3. 3. not at any time; not on any occasion
  4. 5. a mark left on a surface by a person’s foot or shoe or by an animal’s foot
  5. 6. the amount of space between two places or things
  6. 8. bad or harmful
  7. 10. at all times; on every occasion