Difference Between Secondary and Tertiary activities :

Secondary activities: Secondary activities add value to natural resources by transforming raw materials into valuable products. These activities include processing and increasing the utility of the products of the primary activities for example, cotton in the boll has limited use, but after it is transformed into yarn. Becomes more valuable an can be used for making cloths. So production of textiles by processing fibers abstain from animals or plant and production of steel goods by processing iron ore include in secondary activities workers engaged in the activities of secondary production are often called blue collar workers.

Tertiary activities: Tertiary activities are related to the service sector. These activities concerned with providing services rather than production of tangible goods. All types of services are special skill preceded exchange of payment, Health, education, law governed and recreation, etc. requires provisional skills. 

It also require other theoretical and practical knowledge. These activities include a range of personal and business services and they involve a rapidly growing number of workers in highly developed and diversified areas. Topiary activities involve the commercial output of services rather than the production of tangible goods. People engaged in tertiary activities are called pink color workers.