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
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∙ 13y agoWiki User
∙ 11y agobecause it is
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∙ 11y agosteel
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∙ 11y agoSteel
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.
The Romans used the arch to build large buildings and bridges.
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.
Concrete and steel .
brick,mud,wood
wood and hot metal
METAL They used METAL
bridges are colapsing because they are old and the material that the people used is old or the people that built it did not build it right