Dams control the flow of rivers to prevent flooding and direct water where it is needed. How Dams Hold Back Water introduces different types of dams and explores how they work. Easytoread text, vivid images, and helpful back matter give readers a clear look at this subject. Features include a table of contents, infographics, a glossary, additional resources, and an index. Aligned to Common Core Standards and correlated to state standards. Kids Core is an imprint of Abdo Publishing, a division of ABDO.