There are four main types of industry: primary, secondary, tertiary and quaternary. The type of industry a country specialises in changes over time. There are social, environmental and economic ...

economic activity in the primary, secondary, tertiary and quaternary sectors; and the use of natural resources This short film is an ideal tool to help students understand the changes to the ...

Primary agricultural ... nature or from the primary sector. Secondary agricultural goods are treated products and preparations from primary agricultural goods. Together, these form the main definition ...