GCSE Geography Population Revision Notes
Global population distribution The term 'population density' is used to describe the pattern of where people live in the world. There are many reasons for the differences in population density. They can be divided into physical factors and human factors. Physical reasons include accessibility, climate, relief, resource, soil and vegetation. Human reasons include economic factors, political factors and social factors. The demographic transition model The population of the world grows according to two factors: birth rate and death rate. The relationship between these two is called the natural increase . The relationship between birth rate and the death rate has been used to create a four-stage model of a country's population change, called the demographic model. Stage One: High birth rate (BR) and a high death rate (DR). Stage Two: BR remains high, but DR falls by the end of the stage. Stage Three: BR falls rapidly, and DR continues to slowly fall. Stage Four: BR and