Population%20Pyramids%20a.k.a.

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Population Pyramidsa.k.a.

• Population Diagrams
• Population Structures
• Age-Sex Diagrams
• Age-Sex Structures
• Age-Sex Pyramids

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What is a population pyramid?

• A visual representation of the population of a
  country.
• graphically display a population's age and gender
  composition
• show numbers or proportions of males and females
  in each age group
• show gains of members due to immigration and
  birth, and loss of members due to emigration and
  death
• reflect population growth or decline

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Interpreting a Population Pyramid

• Remember that a population pyramid is basically a
  bar graph turned on its side. Each line is
  showing you what percentage of the population is
  a certain age.
• Examine the title and the type of data presented.
  (ex. Age breakup, numbers listed below,
  male-female notation.)
• True pyramids are developing countries. The
  majority of the population is younger and not
  many people live to an old age. Developed
  countries are more rectangular the population is
  spread more equally through the age groups.

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How to interpret population pyramids

• There main types of pyramids
• Rapid growth
• Slow growth
• Negative growth

Shape of rapid growth
Shape of Slow growth
Shape of negative growth
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High, Slow Negative Growth

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Rapid growth
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Rapid growth pyramids

• Have a large base to show high birth rates
• Amount of people decreases as the ages goes up
  indicating a lower standard of living
• Associated with developing countries like
• Brazil, Uganda, China

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Slow Growth
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Slow growth pyramids

• Take on a more rectangular shape
• Indicates population is remaining fairly steady
• Birth rates and death rates are similar
• Associated with developed countries like the UK,
  Germany, Canada

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Negative growth
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Negative growth pyramids

• Looks like a reverse pyramid
• Indicates the population of the country is
  decreasing
• Death rates are higher than birth rates
• Associated with developed countries like
• Austria, Japan, Italy

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What does a Baby Boom look like over
time?http//www.nd.edu/dmyers/courses/old/102au0
0/bb.jpg

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Look at what else one can see in these diagrams