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
e.g.
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
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