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# Unit 6: Test 2

### Population - Test 2

TermDefinition
replacement rate the total fertility rate needed for a population to replace itself (This is usually around 2.1)
baby boomers people born after WWII, from 1946 to 1964 in the United States and Allied countries
pension a fixed amount of money paid regularly to a person, following retirement from work
dependency ratio the number of old and young dependents compared to the working population who supports them
doubling time the length of time it takes for a population to double
famine a severe shortage of food that results in widespread hunger
arable land land suitable for growing crops
arithmetic population density the population of a country divided by its total land area. This calculation assumes people can live anywhere within a country.
physiologic population density the population of a country divided by its total arable land area. This calculation takes into account that there are many places that people canâ€™t live within a country.
Created by: AMS SS6

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