Alternative Energy Sources

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Across
  1. 7. An agency in the US responsible for creating green solutions and renewable energy sources
  2. 8. Deposits of tar that is turned into oil
  3. 9. Extracting fossil fuels by removing soil and rock overlying the mineral deposit
  4. 10. Combustible organic material derived from the remains of former life
  5. 13. Energy harnessed from the flow of water
  6. 17. A machine used to harness wind energy
  7. 18. A gas obtained from combustion of coal, natural gas, and oil
  8. 19. Any source of usable power
  9. 20. Gases released into the atmosphere create this effect that traps the sun's warmth
  10. 22. A system that maintains its own viability for continual use
  11. 23. Energy harnessed from ocean tides
Down
  1. 1. Chemical reaction between two substances that gives off carbon dioxide
  2. 2. Harnessing energy through biological materials
  3. 3. Precipitation that contains acid-forming chemicals
  4. 4. An intergovernmental organization that focuses on transitioning into alternative energy sources
  5. 5. A unit of power used to measure electricity
  6. 6. Extracting coal from within the Earth
  7. 11. Release of harmful gasses into the atmosphere
  8. 12. Energy harnessed from heat sources within the Earth's crust
  9. 14. A way to extract fossil fuels by fracturing rocks in the Earth's surface and injecting chemicals at a high pressure
  10. 15. Energy harnessed by the sun
  11. 16. A method for generating power using solar cells to convert energy from the sun into a flow of electrons
  12. 21. Harmful man-made substances and products in an environment