Tunnels

[|Tunnel Basics]

[|Time Tunnel Game] Soft-Ground Tunnel: Forces: The heavy, wet ground pushes on all sides of the tunnel. The tunnel's walls are squeezed by the ground.

Discussion Questions-
 * ** 1. ** || Where are tunnels usually constructed? Think of different types of tunnels, such as those under water, under land, or through a mountain. Why are such tunnels constructed? What benefits do they serve? ||
 * ** 2. ** || Why do major tunnel projects take so many years to complete? ||
 * ** 3. ** || What are some of the challenges involved in trying to dig through a mountain using a tunnel boring machine (TBM)? ||
 * ** 4. ** || Research a tunnel located in your area. Try to find out the estimated number of cars and trucks that pass through it each day. ||
 * ** 5. ** || What health hazards do tunnel construction workers face? ||
 * ** 6. ** || What precautions can tunnel builders take to prevent injury or death as they work underground? ||