Population Density and Distribution - PowerPoint

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					Population Density and
       Human Population
In the last lesson you learned how
 to be a demographer. A
 demographer looks statistically at
 how people are distributed spatially
 and by age, gender, occupation,
 and so on.
      Human Population
Now that we know how to
 compare populations by using
 population pyramids we have to
 ask ourselves an important
 question. Where do people live
 around the world?
    Population Distribution
Population distribution refers to
 where people live around the
 world. For instance, in the United
 States most people live on the
 coasts or near major waterways.
 Population is not evenly
 distributed around the earth’s
    Population Distribution
Population is not distributed
 evenly because of several factors.
   Population Distribution
The factors that influence
 population distribution are: natural
 resources, climate, economic
 development, government policy,
 rural/urban settlement, capital
 resources, and conflicts.
       Natural Resources
People live closer to valuable
 resources such as oil, arable land,
 and fresh water. Most people in
 the world live near the coast or
 along a major waterway and they
 live on flat ground that is easy to
      Natural Resources
A good example of how natural
 resources affect population
 distribution is China. Western
 China is not heavily populated
 because it is mountainous or a
There are parts of the earth where
 people cannot live or it is very
 difficult to live because it is too
 cold. People don’t live in
 Antarctica and very few people
 live in the arctic.
Few people live in hot climates
 such as deserts. Look at the
 Sahara and Gobi deserts.
Wet climates can also be a problem
 such as tropical rainforests. The
 Amazon rainforest is sparsely
 populated because the soil is not
 very fertile.
    Economic Development
People don’t live in areas where
 there are no jobs. This is one
 reason why people migrate to
 other countries or to cities. We
 will discuss this in a later lesson.
      Government Policy
In the United States people are
 free to live wherever they want,
 however, in countries such as
 China or the former Soviet Union
 the government forced people to
 live in certain areas.
      Government Policy
The Russian government forced
 thousands of people to move to
 Siberia in order to develop the
 natural resources and economy of
 the region.
   Rural/Urban Settlement
The location of cities affects
 population distribution. Think
 about the United States. Most of
 the major cities are on the coasts
 or near the Great Lakes. These
 are also the most heavily
 populated areas.
      Capital Resources
Areas that have good
 transportation networks such as
 roads, trains, subways, or busses
 are more heavily populated.
Wars have a major impact on
 population distribution because
 people flee areas that have
 conflicts. Some examples are the
 Sudan, Rwanda, and the Former
      Population Density
Population density is the number
 of people occupying an area of
 land. In this course we will use
 the number of people who live per
 square mile or kilometer.
 However, there are other ways of
 computing population density.
       Population Growth
 We know where people live and why,
 and we also know where the
 population is denser. Now let’s talk
 about why populations grow quicker
 than others.
      Population Growth
China is the most populated
 country in the world.
In the next 50 years India will have
 more people than China.
Asia has over 1/3 of the earth’s
         Population Growth
 The factors that influence population
     growth are:
A.   Modern medicine and hygiene
B.   Education
C.   Industrialization and urbanization
D.   Economic development
E.   Government policy
F.   Role of women in society
Modern Medicine and Hygiene
 Population will grow in countries with
   good hospitals and doctors because:
A. Babies get regular shots
B. People have regular health care
C. There are no epidemics such as small
   pox, yellow fever, or cholera.
 Population will decrease in countries
   with many educated people because:
A. More people have careers so they
   decide not to have as many children
B. Fewer people are farming so they
   don’t want children
 Population growth will decrease as a
 country becomes more developed.
 Countries that are highly industrialized
 have low population growth rates.
       Government Policy
 The government of China has a one
 child policy. Families can only have
 one child otherwise the population
 would grow too rapidly. If a family has
 more than one child they must pay a
   Role of Women in Society
A. Countries with low population growth
   rates have more women working in
   the labor force.
B. Countries where women are expected
   to stay at home and be housewives
   will have high population growth