Question

Why is iron and steel called backbone of modern industry

Answer 1

because it was the main thing back then that was most valuable other than gold iron and steel was used for almost everything and you could sell or trade it when needed for money or other sources

Answer 2

beacuse for the industry the most required or essential raw material is iron and steel. for the furniture , for the development of any mehanics, for the production of different thing likes car, bus , etc.All industries whether heavy, medium or light depend on it for the machinery. Thus, it provides base to the other industries. Steel is required for manufacturing variety of engineering, construction and defence goods.