All industry is made up of four sectors that are a linked together like a chain: primary, secondary, tertiary and quaternary industry. Industries in the primary and secondary sectors are the ...

All industry is part of a chain that starts with primary industry: the production or extraction of raw materials, like agricultural products or mining; and secondary industry: the processing of ...

Primary agricultural goods are untreated products which come directly from nature or from the primary sector. Secondary agricultural goods are treated products and preparations from primary ...