What are the basic activities in each of the four economic activity levels?

The basic activities in each of the four economic activity levels are the supply and procurement of raw material, manufacturing, creation and dispensation of services, and offering assistance through knowledge.

There are four major economic activity levels. They are,

Every level has a basic function of its own. The primary level hosts activities associated with raw materials, the secondary level deals with production and manufacturing, the tertiary level consists of activities related to services and the quaternary level hosts the knowledge sector activities.

places of higher salinity. there are parts of the ocean where hardly any rain falls but warm dry winds cause lots of evaporation. this evaporation removes water – when water vapour rises into the atmosphere, it leaves the salt behind, so the salinity of the seawater increases. this causes the seawater to become denser.