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Steel
Originally an iron structural skeleton, with a sheet-copper skin.
it is the material, usually steel or iron, that is under the ground to support the bride
The Iron Bridge is located in Shropshire, England. The bridge goes over the Iron Bridge Gorge. It is a pedestrian bridge that was built in 1779. The bridge is made of cast iron.
The ANZAC Bridge in Sydney is made of structural steel, steel cable and concrete
The first iron bridge was made in Coalbrookdale in Shropshire
iron
out of iron and sement
simeon s. post made the truss bridge, but never received a patent
stone
It is a pre-stressed concrete box girder bridge
It hasn't. The current London Bridge is made of pre-stressed concrete.