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POWER OF THE PYRAMIDS - populationeducation.org

POWER OF THE PYRAMIDS . introduction Many of the vast differences we see in societies across the Studies For Our Global Future globe can be related to the composition of their respective populations. This is true on the local, state, and national level. So when exploring variations among countries, a good place to start is with their population PYRAMIDS graphs that display the concept age and sex distribution of the country's population . The age and sex distribution of a population affects its growth rate and provides To help make population projections for different countries, information on its past, present, and future demographers look at the profile of the countries' residents.

© 2018 POPULATION CONNECTION population dynamics unit | POWER OF THE PYRAMIDS 5 Demographers typically use the percentage data instead of the raw data so that each ...

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Transcription of POWER OF THE PYRAMIDS - populationeducation.org

1 POWER OF THE PYRAMIDS . introduction Many of the vast differences we see in societies across the Studies For Our Global Future globe can be related to the composition of their respective populations. This is true on the local, state, and national level. So when exploring variations among countries, a good place to start is with their population PYRAMIDS graphs that display the concept age and sex distribution of the country's population . The age and sex distribution of a population affects its growth rate and provides To help make population projections for different countries, information on its past, present, and future demographers look at the profile of the countries' residents.

2 Growth patterns. What are the ages of the people? How many are men? How objectives many are women? Taking this information, they construct population PYRAMIDS that depict the configuration of a country's Students will be able to: population as impacted by 70 to 80 years of economic, political, Describe the three general shapes of and natural events. population PYRAMIDS and their meanings. Construct a population pyramid for one of Vocabulary: cohort, demographers, population PYRAMIDS , zero six different countries.

3 population growth Make correlations between the shape of a country's pyramid and its growth pattern. materials Analyze countries' population PYRAMIDS to make inferences about past events, current trends, and future growth. Part 1. None subjects AP Human Geography, Geography, Part 2 Environmental Science (General and AP), Student Worksheet (provided) Mathematics POWER of the PYRAMIDS Graph Paper (provided) skills Colored pencils Calculating percentages, graphing and Calculators (optional) analyzing data, interpreting bar graphs, comparing and evaluating, writing Part 1: What is a population method Students use real-world data to construct and Pyramid?

4 Interpret population PYRAMIDS and discuss differences in population growth rates among procedure several different countries. 1. Display the world population pyramid and explain that this is a type of graph used by demographers to study the distribution of people across sex and age categories. 2. Explain to the students that the graph represents the entire world population , sorted by age and sex with the youngest at the bottom and the oldest at the top and males on the left, females on the right. Each age level/sex grouping is called a cohort.

5 A cohort represents the percentage of people within 2018 population CONNECTION. that sex and age range within the population . So World (2017). on the world population pyramid, we can see that Male Female percent of the global population is made up of 75+. males aged 0-4. 70-74. 65-69. 60-64. 3. Ask the students the following comprehension 55-59. questions and allow them time to ask their own 50-54. questions. 45-49. Age 40-44. 35-39. a. What is the largest age cohort and how can 30-34. you tell? 25-29. 20-24. Answer: 0-4 year old males; that bar extends 15-19.

6 Furthest from the center axis. 10-14. 5-9. 0-4. b. What cohort makes up 4% of the global 10 8 6 4 2 0 2 4 6 8 10. population ? Percentage of population Answer: 25-29 year old females. Source: United States Census Bureau, International Database c. Where are you represented on the pyramid? What percentage does your cohort represent? Answers will vary. d. Are there currently more old people or young people living on the planet? How can you tell? Answer: More young people. The cohorts for young ages extend out further than the cohort bars for elderly people.

7 E. In general, the bars get smaller as we move up the graph until the top cohorts they break the pattern and extend further out. Why? Hint: Look at the y-axis and the ages represented in each cohort. Answer: All of the previous cohorts span a five year age increment. The cohorts at the top of the graph 75+ males and 75+ females represent everyone aged 75 years or older. Those cohorts cover a much larger span of ages than the other cohorts. World (2017). 4. Discuss the shape of the world population Male Female pyramid and ask students if they think the graph 75+.

8 Represents a population that is growing or 70-74. shrinking and their reasoning. 65-69. 60-64. 55-59 Post-Reproductive 5. Now display the world population pyramid 50-54. showing the age intervals grouped into 45-49. Age reproductive categories. 40-44. 35-39. 30-34 Reproductive Explain that the percentage of a population that 25-29. falls within each reproductive category provides 20-24. clues to the population 's future growth. As such, 15-19. 10-14. the shape of a population pyramid reveals a lot 5-9 Pre-Reproductive about how a population is growing.

9 0-4. 10 8 6 4 2 0 2 4 6 8 10. Percentage of population Source: United States Census Bureau, International Database 2018 population CONNECTION population dynamics unit | POWER OF THE PYRAMIDS 2. 6. Display the three sample population PYRAMIDS below. Graph 1: Expanding Ethiopia. The triangular shape reflects a growing population . A significant percentage of people are in the pre-reproductive age groups. As those children age and enter their reproductive years and start having children of their own, the population will almost surely grow.

10 Graph 2: Stable New Zealand. The rectangular shape shows a stable population . There is a fairly even distribution of people across each age group. Generations are replacing each other so the population will not grow or shrink. Graph 3: Diminishing Japan. The cup shape shows a shrinking population . The largest percentage of people are in their post-reproductive years and no longer having children. As fewer and fewer people reach reproductive age, the size of the population will decrease. Graph 1 Graph 2. Ethiopia (2017) New Zealand (2017).