Population
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| the study of human populations | demography
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| the number of people per unit of measurement | population density
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| you get this by dividing population by land area | arithmetic density
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| you get this by dividing population by arable land area | physiologic density
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| where people live | population distribution
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| land that is suitable for agriculture | arable land
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| a large area of the world that has a lot of people and high population density | population cluster
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| term used to describe a large urban area comprised of several cities that have grown together | megalopolis
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| region for which the term megalopolis was created | eastern US
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| the feared result of rapid population growth exceeding food supplies. Paul Ehrlich coined the term | population bomb
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| writer that first raised concerns about population growth in 1798 | Thomas Malthus
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| according to Malthus, how population grows | exponentially
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| according to Malthus, how food supply grows | linearly
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| term for the extremely rapid population growth during the 19th and 20th centuries | population explosion
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| period during which chemical fertilizers, pesticides, and hybrid seed varieties enabled food production to increase exponentially | green revolution
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| the percent by which a population increases from year to year | population growth rate
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| the number of babies born per 1000 people in a society | crude birth rate
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| the number of deaths per 1000 people in a given year | crude death rate
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| population growth expressed using only births and deaths | rate of natural increase
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| migration into a country | immigration
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| migration out of a country | emigration
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| immigration minus emigration | net migration rate
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| the average number of babies born per woman | total fertility rate
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| the TFR needed for a population to sustain itself | replacement rate
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| what happens when TFR and net migration drop too low | negative population growth
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| the number of years it takes for a population to double at a given growth rate | doubling time
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| the number of people over 65 per 100 youths under 15 in a society | aging index
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| the tendency for population to stabilize as a country develops economically | demographic transition
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| term for the situation in which birth rates roughly equal death rates | stationary population level
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| a country that is wealthy and whose citizens have access to all modern conveniences | developed state
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| a country that is poorer and in which many citizens do not have access to modern conveniences | developing state
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| the age and gender breakdown of a population | population composition
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| graphic that shows the population composition for a given place | population pyramid
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| the ratio of providers and dependents in a society | dependency ratio
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| someone who is unable to provide for him/herself | dependent
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| someone who earns money and contributes to the care of others | provider
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| the number of people in a society who are willing and able to work | workforce
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| policies which encourage people to have more children | pronatalist policies
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| policies which discourage people from having lots of children | antinatalist policies
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| policies which encourage some people to have children while discouraging others | eugenic policies
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| things that encourage people to do something (such as have children) | incentives
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| China's famous population control strategy | one-child policy
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| the ratio of women to men in a country | gender ratio
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