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Population distribution refers to how populations is distributed unevenly around
the globe. Because of this varied distribution, different regions and
countries have different population densities. Population density measures
the average number of people per square kilometer. The population density in a
given country can be calculated by dividing the population by the area of
that country. For example is on 2014 Thailand had a population of 68.7
million people spread over 513000 square kilometers.
When you divide 68.7 million by 513
thousand square kilometers you get a population density of one hundred and
thirty three point eight people per square kilometer. Patterns of population
density can be displayed on a map such as a choropleth map or a dot distribution map.
For example this current plate map shows the population density on a
global scale. You can see that for places with high population densities are
mainly found in the northern hemisphere. As mentioned earlier, some regions are densely
populated, while other regions are sparsely populated. For example, in
Sichuan Province China, the Sichuan Basin in the east is said
to be densely populated. The mountainous western regions of the
province is sparsely populated. Factors that encourage high population densities
include the following. Regions of low elevation tend to have milder climates
which attracts the people. Regions low-lying fertile land are good for
agriculture. For example the North China Plain which lies flood plains of the
Yangtze and Yellow Rivers. Regions with a good supply of natural resources are rich in
resources such as copper and fossil fuels. Coastal areas tend to have a
higher population than inland areas. For instance the vast majority of
Australians live with 100 kilometers of the coastline. There several reasons for this.
Coastal areas have a much milder climate than inland areas.
They have rich resources such as fisheries. Coastal areas were also for those areas reached by
immigrants, when new countries like Australia, New Zealand and the Americas were first settled.
Factors that tend to result in sparse population densities include regions
with extreme climates. For example extremely hot dry regions such as the
deserts of Western Australia or cold regions such as the polar regions.
Regions with high elevation such as the Qinghai-Tibetan plateau. At high
altitudes temperatures tend to be cooler and soils are thinner and less fertile.
The rugged relief these regions also makes development very difficult. In addition to
extreme climates, regions in the interior of continents also tend to have poor access.
Regions with dense impenetrable jungles are also sparsely populated.


人口密度 (Why do some places have a greater population density than others?)

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大文 發佈於 2020 年 4 月 8 日
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