The industrial sector has been classified into following groups based on the source of raw materials.
1. Agro based Industries.
2. Forest based Industries.
3. Mineral based Industries.
1. Agro based Industries: The group of industries which are depending on agriculture for the raw materials for ex: Cotton for cotten textile Industries, Jute for Jute industries, Sugarcane for Sugar industry & Sericulture for silk Industry.
2. Forest based Industries: The group of industries which are depending on forest for the raw materials for ex: Bamboo for Paper industry, Rubber for Rubber industry etc.
3. Mineral based Industries: The group of Industries which are depending on minerals for ores for ex: Iron ore for Iron and steel industry, Bauxite for Aluminium Industry.
Thus secondary occupation are concerned with manufacturing and constructions therefore primary and secondary economic activities are interdependant & co-related.
