Energy of the future

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Across
  1. 4. A barrier that holds back water."
  2. 9. "Energy from the sun."
  3. 10. "A machine that spins to make energy."
  4. 11. "Energy from moving air."
  5. 13. "The natural world around us."
  6. 14. It stores energy to power devices.
  7. 15. "Gases released into the air by cars or factories."
Down
  1. 1. "To fill with power again."
  2. 2. "Harmful substances in air, water, or soil."
  3. 3. "It gives power to phones and batteries."
  4. 5. "A clean fuel made of one type of atom."
  5. 6. "Fuel for cars, usually from oil."
  6. 7. "A machine that makes things move."
  7. 8. "A process where things burn to release energy."
  8. 12. "Fuel for cars, often from gas stations."