Tunnels

Tunnels book cover — Tunnels By Virginia Loh-Hagan

Tunnels — page 1 — There is a large network of train tunnels under New York City called subways

Tunnels — page 2 — What Are Tunnels Early in history Romans built tunnels to carry water They built tunnels to carry away waste Tunnels still provide these services They’re also built for transportation They carry heavy things over great distances Trains and cars increased the need for tunnels Tunnels were also built for mining Engineers study how to dig tunnels They design bigger better tunnels

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