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Agricultural Density
The ratio of the number of farmers to the total amount of land suitable for agriculture.
Measuring agricultural density help account for economic differences.
Two countries can have similar physiological densities but produce significantly different amounts of food because of different economic conditions.
Developed countries have a lower agricultural density because technology and finance allow a few people to farm extensive land areas and feed many people.
The highest agricultural density's are found in Asia and sub-Saharan Africa. The lowest are in North America, Europe, and South Pacific.
P49
See of 48 for a chart that compares arithmetic physiological and agricultural density. Note the paragraph on top of page 49 that talks about the comparison of physiological density to agricultural density and how it relates to that chart.
Arithmetic density
The total number of people divided by the total land area.
To computer arithmetic density divide the population by the land area.
This enables geographers to compare the number of people trying to live on a given piece of land in different regions of the world.
Arithmetic density answers the "where" question.
The highest arithmetic density's are found in Asia, Europe, and Central America.
The lowest are on North and South America and South Pacific.
See Page 48 for a chart comparing different types of density.
Census
A complete enumeration of a population.
Page 45
Crude birth rate. (CBR)
A measure of population growth or change.
The total number of live births in a year for every 1000 people people alive in the society.
A CBR of 20 means that for every 1000 people in a country, 20 babies are born over a one year.
Page 50
Crude death rate (CD-R)
The total number of deaths in a year for every 1000 people alive of the society.
Crude death rate is expressed annual number of deaths per 1000 population.
Demographic transition
The process of change in a society's population from a condition of high crude birth and death rates and low rate of natural increase to a condition of low crude birth and death rates, low rate of natural increase, and a higher total population.
Page 56
Demography
The scientific study of population characteristics.
Page 44
Dependency ratio
The number of people under age 15 and over age 64 compared to the number of people active in the labor force.
The number of people who are too young or too old to work.
Compared to the number of people and their productive years.
The larger the dependency ratio, The greater the financial burden on those who are working to support those that do not.
Page 54
Doubling time
The number of years needed to double population, assuming a constant rate of natural increase.
Doubling time directly related to the NIR. Remember, the NIR is the percentage by which a population grows in a year. So the higher the NIR, the higher the doubling time.
Ecumene
The portion of earth's surface occupied by permanent human settlement.
Page 47
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