Industry refers to an economic activity that is concerned with production of goods, extraction of minerals or the provision of services., Industries can be classified on the basis of raw materials, size and ownership., Agro based industries use plant and animal based products as their raw materials., Cottage or household industries are a type of small scale industry, Cottage or household industries are a type of small scale industry, The world’s major industries are the iron and steel industry,, before 1800 A.D. iron and steel industry was located where raw materials, power supply and running water were easily available.,

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