How can we hold up water? Use a dam! In this BrainPOP movie on dams, Tim and Moby teach you why these massive devices are so useful. Starting in ancient Egypt and Iraq, Tim and Moby explain how dams have irrigated dry farmland, and how they can be used to generate electricity and control flooding. You’ll learn the meaning of terms like reservoir, aqueduct, hydroelectricity, turbine, and fish ladder. And you’ll also how dams are built, and how they can be harmful to the environment. Oh, and if you’ve ever wondered what dams have to do with the water we drink, watch this movie to find out!