Effect of Geography on Population Distribution

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Where the world population is distributed? Key issue 1
-we can understand how population is distributed by identifying two basic properties.
1. Concentration
2. Density
Population concentrations
-two thirds of the world’s population is clustered in 4 regions: East Asia, South Asia, Southeast Asia, and Western Europe. - The clustering of the world’s population can be displayed on a cartogram, which despites a countries size according to its population not its land area. Major population clusters

-1/5 of the world’s population lives in east Asia.
-1/5 of population lives in south Asia
- Southeast Asia is world’s 4th largest cluster and Western Europe is the third largest. Other population clusters
-The largest population cluster in the western hemisphere is the northeastern U.S and southern Canada. Sparsely populated regions
-Human beings avoid clustering in certain physical enviorments, because either too hot, too cold, too dry, etc. - The portion of the earth’s surface preoccupied by humans is known as ecumene.
1. Ecumene has increased over the last centuries.
Population density

Arithmetic density
* Geographers frequently use arithmetic density which is the total number of people divided by the total land area. * Geographers rely on this to compare conditions in different countries because the info needed to calculate the measure is easy to obtain. * Arithmetic answers the where question but doesn’t answer the why Physiological density

-A more meaningful population measure is afforded by looking at the number of people per area of a certain type of land in a region. -In a region, the number of people supported by a unit area of arable land is called physiological density. -The higher this is the greater pressure that people may place on the land to produce enough food. - Physiological density provides insights into the relationship between the size of a population and the availability for natural resources in a region....
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