DEMOGRAPHY
It is the study of human populations.
There are four factors that can change the size of a population
The number of deaths
Immigration
The number of births
Emigration
Census
It collects data. It has the information about people and their family.
Absolute population
The total number of inhabitants in an area
Natural increase
= Births - Deaths
Positive: births>deaths
Negative: births<deaths
Actual increase
= Natural increase + Immigrants - Emigrants
Positive: population increases
Negative: population decreases
Population density
The average number of people in an area.
= population / square kilometres
Rural areas: low population density
Urban areas: high population density
Factors affecting population density
Natural causes
Social causes
Political
Economic causes