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Question 21
How does a waterfall become electricity? by Mike Graf.  Explores how dams help generate water power, early uses of water power, the benefits of water power, and other types of energy.
  1. 300-399:  Who Is My Neighbor?
  2. 500-599:  What Will I Talk About? Natural Sciences.
  3. 600-699:  What Will I Do With Science? Applied Science, Technology