Building a Tunnel (Sequence Amazing Structures)

Readers learn how engineers examine soil and rock, identify underground obstacles, prepare construction sites, and use specialized equipment such as tunnel-boring machines to excavate beneath the ground. Full-color photographs and a timeline help children visualize the sequence of events and understand how many stages and workers are involved in transforming an engineering plan into a finished tunnel. A glossary, additional resources, an author’s note, and an index provide further information and reinforce the engineering and construction concepts introduced throughout the book.