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Overcoming Earth´s Obstacles, Bridges (Types (Arch (The weight of the arch…
Overcoming Earth´s Obstacles
Bridges
Types
Arch
The weight of the arch is supported by abutments
Suspension
Use steel cables
Beam
Is a horizontal surface with vertical supports at either end
Overcoming Earth´s Obstacles
Tunnels
Definition
Thy are long, narrow passages that allow many things to cross from one side to another
They allow to cross
People
Trains
Animals
Function
Carry water, or dispose of waste
Protect cables of power and communication
Subway trains
Create walkways under city streets