"The 21st Century Junior Library Extraordinary Engineering series explains how important feats of engineering are accomplished. Bridges examines the engineering concepts that make these critical structures possible. Sidebars encourage readers to engage in the material by asking deeper questions or conducting individual research. An activity, full color photos, a glossary, and a listing of additional resources all enhance the learning experience"--From the publisher's web site.

Includes glossary.

What are bridges? -- How are short and long bridges supported? -- How do arch bridges work? -- How do bridges hang in the air? -- Try this!.