Why is the global population increasing? The Population Pyramid Chapter 2 – Key Issue 2 The Population Pyramid

The Population Pyramid Population Pyramids A bar graph that can visually display a country’s distinctive population structure. X-axis Percent male displayed to the left of zero Percent female displayed to the right of zero Y-axis Age cohorts typically grouped in 5-year intervals Youngest displayed at bottom and oldest at top

The Population Pyramid Population Pyramids What characteristics about each city can you infer with the use of population pyramids? How can population pyramids help a government or community? What resources and services are necessary in each city?

TED - ED

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A. Ann Arbor, MI - University of Michigan Helpful Hints… A. Ann Arbor, MI - University of Michigan B. Buffalo county, SD - Crow Creek Indian Reservation, one of the poorest counties in the United States C. Punta Gorda, FL - retirement community D. Leavenworth, KS - United States Penitentiary E. Manhattan, NYC - wealthy downtown, few large families F. Nothhamton, MA - Smith College, an all girls college G. Fort Bragg, NC - United States Army Fort H. Springfield, IL - average American city 1

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Answers 1. B 2. A 3. E 4. C 5. G 6. H 7. F 8. D 1

The Population Pyramid Population Pyramid can help us learn lots of things… More on this in Key Issue 3 In order to use them well, we need to understand Sex Ratio Defined as the number of males per 100 females in the population Developed countries have more females than males, because they tend to live 7 years longer. Dependency Ratio Defined as the number of people who are too young or too old to work, compared to the number of people in their productive years. People aged 0 to 14 and over 65 years old are considered dependents. Larger dependency ratios imply greater financial burden on the working class. 85 percent in sub-Saharan Africa, while 47 percent in Europe.

Creating and Analyzing Population Pyramids Using the data provided, complete the population pyramids for Country A and Country B. Consider what each country needs (services) in order to provide for their population. Complete the Reflection Questions Describe the characteristics of Country A Identify some services necessary to serve the population of Country A over the next 10- 15 years. Describe the characteristics of Country B Identify some services necessary to serve the population of Country B over the next 10- 15 years.