Population - The total number of people living in an area, Population explosion - The rapid increase in the population seen since 1800, Demographer - A person who studies population, Birth rate - The number of babies born per 1000 of the population per year, Death rate - The number of deaths per 1000 of the population per year, Life expectancy - The number of years a person is expected to live, Sparse population - People are spread out over a large area. Few people per km2, Dense - Many people living close together. Many people per km2, Population distribution - The spread of the population over a given area, Population density - How spread out or far apart people live, Population structure - The number of % of males and females in each age cohort of the population, Population pyramid - Graph showing the population structure, Economically active - Section of the population who are working age, Young dependents - Section of the population who are too young to work and are supported by the economically active, Elderly dependents - Section of the population who have retired and are supported by the economically active, Ageing population - A large proportion of the population are over 65, Youthful population - A large proportion of the population are under 16, Over populated - Too many people and not enough resources available to sustain them, Under populated - Too few people to support its population's standard of living, Migration - The movement from one place to another nationally or internationally,

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