Russ's Renewable Energy Riddles!

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Across
  1. 2. Due to the fact that solar and wind energy isn't constant, it is very important that we improve this to be able to store excess energy for when we need it.
  2. 5. Wind energy relies on both horizontal and vertical rotation of this!
  3. 6. This is considered the most abundant energy source on earth, providing 10,000 times more energy than we need!
  4. 7. This renewable energy's blades are often connected to the death of these animals.
  5. 9. This is the energy source human beings have relied on the longest! (Remember Hans and Franz!)
  6. 10. While this energy source doesn't produce any air pollution or carbon dioxide, it does create waste which can remain deadly for hundred of thousands of years.
  7. 12. This renewable energy source is actually capable of slowing down the very thing that powers it!
Down
  1. 1. This renewable energy source is often falsely connected to earthquakes.
  2. 2. Wood, algae, crops, and even garbage can are considered to be part of this renewable energy.
  3. 3. Shockingly, almost all renewable energy is designed to create this! (See what I did there!)
  4. 4. It is estimated we have a roughly 50 year supply of this fossil fuel.
  5. 8. The original source of almost all energy on Earth.
  6. 11. This form of energy is defined as one that is naturally replenishing.