# Population Pyramids. There are generally three types of population pyramids created from age-sex distributions-- expansive, stationary and constrictive.

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Population Pyramids

There are generally three types of population pyramids created from age-sex distributions-- expansive, stationary and constrictive. Examples of these three types of population pyramids appear at the end of this report. Definitions of the three types follow:

1. EXPANSIVE population pyramids show larger numbers or percentages of the population in the younger age groups, usually with each age group smaller in size or proportion than the one born before it. These types of pyramids are usually found in populations with very large fertility rates and lower than average life expectancies.. EXPANSIV E

2.STATIONARY or near-stationary population pyramids display some what equal numbers or percentages for almost all age groups. Of course, smaller figures are still to be expected at the oldest age groups. The age-sex distributions of some European countries, especially Scandinavian ones, will tend to fall into this category.

3. CONSTRICTIVE population pyramids display lower numbers or percentages of younger people.

World Population Target In demographics and ecology, Population growth rate (PGR) is the fractional rate at which the number of individuals in a population increases. Specifically, PGR ordinarily refers to the change in population over a unit time period, often expressed as a percentage of the number of individuals in the population at the beginning of that period. This can be written as the formula:

Population pyramids are used to show information about the age and gender of people in a specific country. MaleFemale Population in millions This population pyramid is typical of countries in poorer parts of the world (LEDCs.) Where is the highest birth rate? What about the death rate? Is it high or low? In this country the highest Birth Rate Is 0-4 There is also a high Death Rate.

Why did age 5-9 go down drastically, then go back up?

In some LEDCs the government is encouraging couples to have smaller families. This means the birth rate has fallen.

MaleFemale Population in millions In this country the number of people in each age group is about the same. The largest category of people were born about 40 years ago. In this country there is a low Birth Rate and a low Death Rate. This population pyramid is typical of countries in the richer parts of the world (MEDCs.)

Population in millions MaleFemale In this country the birth rate is decreasing. In the future the elderly people will make up the largest section of the population in this country. This is happening more and more in many of the world’s richer countries.

Male Female Population in thousands This country has a large number of temporary workers. These are people who migrate here especially to find a job.

Population pyramid for Mozambique. Population pyramid for Iceland.

What happens next?

What is going to happen to Japan’s population in the future? Why does this matter?

Population pyramids are used to show information about the age and gender of people in a specific country. MaleFemale Population in millions In this country there is a high Birth Rate There is also a high Death Rate. This population pyramid is typical of countries in poorer parts of the world (LEDCs.)

In some LEDCs the government is encouraging couples to have smaller families. This means the birth rate has fallen.

MaleFemale Population in millions In this country the number of people in each age group is about the same. The largest category of people were born about 40 years ago. In this country there is a low Birth Rate and a low Death Rate. This population pyramid is typical of countries in the richer parts of the world (MEDCs.)

Population in millions MaleFemale In this country the birth rate is decreasing. In the future the elderly people will make up the largest section of the population in this country. This is happening more and more in many of the world’s richer countries.

Male Female Population in thousands This country has a large number of temporary workers. These are people who migrate here especially to find a job.

Population pyramid for Mozambique. Population pyramid for Iceland.

What happens next?

What is going to happen to Japan’s population in the future? Why does this matter?

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File path - Student pool/Geography/Year 9/Population/Pyramids Your task: Open your own PowerPoint presentation. Go to www.census.gov www.census.govwww.census.gov Select Search and type in IDB. Select International Database From here select Population Pyramids. Find a population pyramid typical of a poor country (LEDC) copy and paste it into your PowerPoint document then add labels to explain what is shown. Repeat for an MEDC (rich) country. For a country of your choice copy and paste the pyramids for 2000, 2025 and 2050. Write about what the graphs show and try to give reasons for the patterns. Explain how the population of this country is changing and say how that could affect the country.

File path - Student pool/Geography/Year 9/Population/Pyramids Your task: Open your own PowerPoint presentation. Go to www.census.gov www.census.govwww.census.gov Select Search and type in IDB. Select International Database From here select Population Pyramids. Find one example for each of the three types of population pyramids. *Expansive *Stationary *Constrictive For a country of your choice copy and paste the pyramids for 2000, 2025 and 2050. Write about what the graphs show and give reasons for the patterns. Explain how the population of this country is changing and explain how that might affect the country.

When you have finished; Find out some background information on each country and add this to your presentation. Concentrate on facts and figures which you can use to compare the countries such as % of the children at school, type of jobs available, how rich or poor (GDP per capita.)………

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