bridges and tunnels

bridges and tunnels

1. beam bridges

   • is used to short spam
   • is the most common
     • is large
       • the most longest in the wordl is 38 Kilometers

2. tunnels

   • they can carry people trains and cars

3. a tunnel borer

   • they carry cables or water

4. types of bridges

5. arch bridges

   • the firts to build was the acient greecks
     • this bridges carry water

6. Suspension bridges

   • are more modern
     • in the pats was suspended by ropes
     • now are steel cables
     • support people cars and trains