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# Population terms

### Key terms

TermDefinition
Birth rate per thousand The average number of births per 1000 people in the population per year
Death rate per thousand The average number of deaths per 1000 people in the population per year
Life expectancy The average nuber of years a person is expected to live
Population density The average number of people per square kilometre
Emigrate When someone leaves a country
Natural increase The birth rate minus the death rate
Population pyramid A graph showing how the population is composed of different genders and age groups
Refugees People who are forced to migrate
Zero population growth When the birth rate is equal to the death rate
Distribution How people are spread out
Population density The nuber of people in an area
Demographic transition model A graph used to show population changes
Infant mortality The number of children out of every 1000 born alive who die before the age of one
Population structure The number of males and femeles within different age groups in a population
Dependency ratio % of people who are working (economically active) / % people whow are dependent (young and old)
Created by: lychee

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