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Bridges take cars, trains, and people across rivers, lakes, and canyons. This introductory title covers the materials used in bridge construction, the types of bridges, and the scientific concepts that make bridges work.
Dams are not just built to stop water. They can also change the direction it flows! Beginning readers will delve into this title that explains the kinds of dams, how forces act on them, and the benefits of certain materials in dam construction.
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