Population-LeBlanc
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| agricultural density | the ration of the number of farmers to the total amount of land suitable for agriculture
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| agricultural revolution | time when human beings frist domesicated plants and animals and no longer relied on hunting and gathering
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| arithmetic density | the total number of people divided by the total land area
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| census | a complete enumeration of a population
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| crude birth rate | the total number of live births in a year for every 1000 people alive in the society
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| crude death rate | the total number of deaths in a year for every 1000 people alive in the society
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| demographic transition | a process of change in a society's population
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| demography | the scientific study of population characteristics
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| dependancy ratio | the number of people under the age of 15 and over age 64, compared to the number of people active in the labor force
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| doubling time | the number of years needed to double a population, assuming a constant rate of natural increase
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| ecumene | the portion of earth's surface occupied by permenant human settlement
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| industrial revolution | a series of improvements in industrial technology that transformed the process of manufacturing goods
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| infant moratility rate | the total number of deaths in a year among infants under one year old for every 1000 live births in a society
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| life expectancy | the average number of years a newborn infant can expect to live at current mortality levels
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| medical revolution | medical technology invented in Europe and North America difused to the less developed countries of Africa, Asia, and Latin America
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| natural increase rate | the percentage by which a population grows in a year
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| overpopulation | the number of people in an area exceeds the capacity of the environment to support life at a decent standard of living
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| physiological density | the number of people supported by a unit area of arable land
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| population pyramid | a country's population displayed by age and gender groups on a bar graph
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| sex ratio | the number of males per 100 females in the population
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| total fertility rate | the average number of children a woman will have throughout her child bearing years
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| zero population growth | when a country's crude birth rate declines until it equals the crude death rate and the natural increase rate approches 0
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