Population distribution shows how people are spread over an area. The worlds population is unevenly spread.
Population density is the number of people in an area.
population = area km2
Scottish Highlands 8 per km2 - sparse
Centre London 4400 per km2 - dense
Population explosion is when the worlds population is increasing very fast.
Birth rate - number of live births per 1000 population per year
Death rate - number of deaths per 1000 population per year
Natural change - the difference between the birth rate and the death rate
Population is also affected by migration
Immigrants - move in
Emmigrants - move out
A push factor is when people want to move away from things they don't like e.g. wars and a shortage of food
A pull factor is when people move to a place with things they like e.g. Education and family links
LEDC - Less economically developed country
MEDC - More economically developed country