CHAPTER 1 What Is a Tunnel 4 CHAPTER 2 Building Tunnels 8 CHAPTER 3 Types of Tunnels 14 ACTIVITIES TOOLS Try This 22 Glossary 23 Index 24 To Learn More 24
What Is a tUNNEL What’s that up ahead A tunnel A tunnel is a passage that goes through or under roads mountains rivers and oceans
Amazing Structures: Tunnels
In Tunnels, early fluent readers will learn about the engineering that goes into building tunnels and making them safe.
