Which is an example of a secondary economic activity?
processing
herding
services
education

An example of a secondary economic activity is processing.

Explanation:

The industrial sector or secondary sector is the economic sector with all companies and activities that process the raw materials from the primary sector. The products are usually resold to the consumer by the tertiary sector.  

The secondary sector is also known as the industry. Strictly speaking, industry is only the most important form of expression in the sector. The crafts, construction industry and other non-industrialized manufacturing industries are also included in the secondary sector.

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