The amount of insolation received varies from latitude to latitude. The Regions within the equator and 40° N and S latitudes are energy surplus regions because they receive abundant sunlight and hence more heat will be gained than lost.The Regions beyond 40° N and S latitudes are energy deficit regions because they lose more heat than that gained from sunlight.
Pastoral Herding is also known as nomadic herding and pastoral nomadism. This is an economic activity more advanced than food gathering and hunting because the people living by pastoral herding make at least some investment to enhance natural production. Labour to enhance and nurture the supply of animal products is the chief investment of the peopleengaged in this occupation.
Heifer – a cow that has not borne a calf, or has borne only one calf. In North America, a typical farm has about 100 milk cows and as many young female stock called heifers. The heifers are raised as replacement cows.