Question

why does bases of bridge and building are made of metal​

Answer 1

Answer:

Steel is an ideal material for bridges. It is an essential part of modern bridges because it is strong, can flex without fracturing and has a long life, even in the harshest conditions. It can be used to build bridges of any length because of its durability and ease of manufacture and maintenance.

Answer 2

Answer:

Steel is a useful bridge material because of its high strength in both compression and tension. Steel is also a ductile material, meaning that it can be bent or shaped easily into different forms.