some materials used in bridges are concrete, steal, metal [may rust and fall if metal ]
the first bridge may or may not have been made of wood
because it is
steel
Steel
Iron is not used to build houses, but iron is used in other things because it is strong.
Mostly metal because it is strong and very stable
Because steel is stronger than wood. But I'm not sure steel is stronger than metal, but steel is a metal and a pretty tough one.
Aluminum
Metal and Steel ANSWER B: The majority of arch type bridges and viaducts were made from brick or stone. Concrete has also been used.
Concrete and steel .
The designs that are used to build bridges are designs that can keep them stable , working and that won't be dangerous also designs that amaze people.
The Romans used the arch to build large buildings and bridges.
METAL They used METAL
brick,mud,wood
wood and hot metal
i dont know but its strong