Jacob and Isaac Crossword assignment

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Across
  1. 3. The energy of motion.
  2. 5. The types of alternative energy sources that people most often talk about are ____ energy sources.
  3. 7. ____ Energy can be stored in an object's position.
  4. 11. People discovered energy ____ 1000's of years ago.
  5. 13. Heat energy is also known as _____ energy.
  6. 14. The amount of ___ energy that strikes the surface of the earth in one hour is more than enough to supply every person on the planet with electricity for an entire year.
  7. 15. Most photovoltaic cells are made of the element ____.
  8. 16. Wind power makes up a ___ portion of the energy used in America.
Down
  1. 1. A power ___ is a system that produces electricity.
  2. 2. We can't store electricity ____.
  3. 4. _____ energy is stored in the bonds that hold molecules together
  4. 6. We use lots of energy in the early _____.
  5. 8. In the Us alone, we burn almost 800,000 barrels of ___ every hour.
  6. 9. The standard definition of ___ is the ability to do work.
  7. 10. oil, natural gas, and ___ make up 80% of the energy we currently use.
  8. 12. The site for wind turbines need to be open, and ___ places.
  9. 15. Our planet's greatest renewable energy is the ___.