1. Ruslan Yuki Gutierrez 607

2. Hydroelectricity The energy of falling water converted to electricity. It comes from the water going down pipes and passing through turbines in a dam. Hoover Dam on the Colorado River http://en.wikipedia.org/wiki/File:Hoover_dam_f rom_air.jpg

3. http://www.internationalrivers.org/china/three-gorges-dam http://www.asianinfrastructure.com/news/newsthree-gorges-dam/

4. Renewable or Non-Renewable? Hydroelectricity is a renewable energy source. This is because no matter how much you use hydroelectricity, you can still use it again and the water will not stop being usable.

6. +Advantages+  It is a renewable energy source.  It doesn’t contribute to global warming.  It doesn’t contribute to acid rain either.  It is cheap to run once built.  It is readily available (it will always be generating electricity).

7. -Disadvantages-  It can kill fishes.  It can destroy habitats of underwater life.  It can cause flooding.  It is unsightly.  It is expensive to build.  Few areas are suitable.  Often times the builders must destroy towns to build the dams.

8. References  Exploring Technology Vol. 5, Marshall Cavendish ©2004  How It Works Science and Technology Vol. 8, Marshall Cavendish ©2003