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Population Pyramids and Population Density Maps

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Title: Population Pyramids and Population Density Maps


1
Population PyramidsandPopulation Density Maps
2
Population
  • Two useful ways that geographers can graphically
    display population information include
  • Population Maps to depict population density
  • Population Pyramids to depict population
    distribution

3
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

4
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.

9
Population Pyramids
  • These graphs show how a population is distributed
    between age groups and sexes by percentages or
    numbers.

10
  • Lower age groups are at the bottom
  • Men are left of center
  • Women are right of center

11
  • In this pop. pyramid, the majority of the
    population is young, because there is a high
    birth rate and a high death rate

12
India, year 2000 large young population, high
birth rate, high death rate
13
India, year 2025 death rate decreases, the
younger population grows older
14
India, year 2050 the population has bulged in
the 25-39 age groups
15
China 1950-2050
16
South Koreas Population Boom
17
The Aging of Japan
  • Low Death Rate and Dropping Birth Rate

18
Triangle
  • Developing
  • Rapid Growth

19
Box
  • Developed
  • Slow Growth

20
Modified box, glass or cup
  • Higly Developed
  • Negative Growth

21
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

22
Neo-Malthusian Theory
  • The population is growing faster than Malthusian
    anticipated
  • Beyond the capacity of food and
  • Clean air
  • Living space
  • Fuel

23
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.

24
What do you think is going on in each U.S. city?
Write down your guesses in your important books.
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