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Key population terms
Population density relates population to area, (average) the total population in a country or region divided by its area (people/km2).
Crude birth rate the number of births per 1000 people (CBR).
Crude death rate the number of deaths per 1000 people (CDR).
Natural increase The difference between the CBR & the CDR usually expressed as a % per year. Natural increase (%) = CBR CDR.
Demographic transition describes what has happened to birth & death rates in todays MEDCs since 1800.
Migration controls the shape of population pyramids, at a natural scale, birth & death rates are most important, migration is important in smaller areas (cities/ regions).
Life expectancy how long people in certain countries are expected to live.
Age dependency percentage of population that depend on economic support (e.g. pension for the elderly, school for the young).
Replacement level the rate that is needed to replace both parents.
Family planning birth rates have fallen where children have been immunised & where mothers have received some education.
Population pyramids age & sex structure of a population can be shown in this type of graph, factors control the shape, birth & death rates & migration.