WHAT ARE BBIDGES MADE OF?
Bridges can made many materials. Early bridges were mabe of wood or stone. many wooden bridges were covered. to protect. them from snow and rain so they would last longer. Stone was much stronger than wood many stone birdges built nearly 2,000 years ago by the ancient Romans still stand today The Romans built theri largest bridges to supply water to towns and cities. Aqueducts marched across valleys and plains over much of Europe.
Stone birdges were strong enough to carry all traffic until the railroad came along in the 1800s. Builders then began to use iron and steel. Steel and concrete are the major materials used today for building bridges.