Como a Represa Hoover realmente funciona

The video begins at 0:00 with an introduction to how the Hoover Dam really works, then at 0:42 it explains why the United States needed the dam, followed by a discussion of the project and its location at 2:30, the construction process at 4:32, a detailed explanation of how the dam operates at 9:05, an overview of its environmental impact at 11:00, and finally a look at the dam's future at 12:20.