Title: Population Pyramids and Population Density Maps
1Population PyramidsandPopulation Density Maps
2Population
- Two useful ways that geographers can graphically
display population information include - Population Maps to depict population density
- Population Pyramids to depict population
distribution
3Population 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
4One type of population map shows one dot for
every certain number of people who live in a
place
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6Another type shows population as color coded
regions
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8Population 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.
9Population 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
12India, year 2000 large young population, high
birth rate, high death rate
13India, year 2025 death rate decreases, the
younger population grows older
14India, year 2050 the population has bulged in
the 25-39 age groups
15China 1950-2050
16South Koreas Population Boom
17The Aging of Japan
- Low Death Rate and Dropping Birth Rate
18Triangle
19Box
20Modified box, glass or cup
- Higly Developed
- Negative Growth
21Population 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
22Neo-Malthusian Theory
- The population is growing faster than Malthusian
anticipated - Beyond the capacity of food and
- Clean air
- Living space
- Fuel
23According 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.
24What do you think is going on in each U.S. city?
Write down your guesses in your important books.
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