Population Pyramids and Population Density Maps

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Population PyramidsandPopulation Density Maps
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Population

• Two useful ways that geographers can graphically
  display population information include
• Population Maps to depict population density
• Population Pyramids to depict population
  distribution

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Population Density

• is a measure of how many people live in a
  certain unit area
• Take the population of a region and divide it by
  its square area
• Ex. The population density of Texas is 79.6/mi²
• On average, 79.6 people live in a square mile in
  Texas

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One type of population map shows one dot for
every certain number of people who live in a
place
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Another type shows population as color coded
regions
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Population Pyramids

• A population pyramid is a bar graph, usually in
  the shape of a pyramid, used to compare different
  age groups of men and women.

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Population Pyramids

• These graphs show how a population is distributed
  between age groups and sexes by percentages or
  numbers.

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• Lower age groups are at the bottom
• Men are left of center
• Women are right of center

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• In this pop. pyramid, the majority of the
  population is young, because there is a high
  birth rate and a high death rate

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India, year 2000 large young population, high
birth rate, high death rate
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India, year 2025 death rate decreases, the
younger population grows older
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India, year 2050 the population has bulged in
the 25-39 age groups
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China 1950-2050
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South Koreas Population Boom
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The Aging of Japan

• Low Death Rate and Dropping Birth Rate

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Triangle

• Developing
• Rapid Growth

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Box

• Developed
• Slow Growth

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Modified box, glass or cup

• Higly Developed
• Negative Growth

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Population Growth Theories

• Malthusian Theory
• In 1798 Thomas Malthus published his theory
• The population will continue to grow until it
  surpasses the food supply
• People will starve reducing the population back
  to a sustainable level

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Neo-Malthusian Theory

• The population is growing faster than Malthusian
  anticipated
• Beyond the capacity of food and
• Clean air
• Living space
• Fuel

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According to these theories, a catastrophe is
imminent to reset the population

• Evidence
• Starvation in Africa
• Loss of farmland in China, South America, and
  Africa
• Natural disasters worldwide

• World population since 500 A.D.

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What do you think is going on in each U.S. city?
Write down your guesses in your important books.
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