The construction of dams is a prime example of how human activity influences the natural environment and changes the surface of the Earth. Built between 1931 and 1936 in the Colorado River, the Hoover Dam provides power for public and private utilities. This dam is a prime example of how humans are trying harness the power of alternative energy sources. Learn more about the purpose and effects of the dam by viewing the video segment Hoover Dam and Hydroelectric Power from eMediaVA℠.

Once you have viewed the video linked above, consider the following questions: In your opinion, what are the pros and cons of dam construction to create hydroelectric power? Do you think that dams are worth the impact that they have on the environment? Do you think that hydroelectric power is the best alternative form of energy? Why or why not?

Post your response in the discussions area. Then, return to the topic several times over the next few days to read your classmates' posts. Reply to at least two of them, making sure to offer new insight, ask questions, and encourage further discussion.