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What does it all mean? 7 Billion and Beyond
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Population Pyramids
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Population Pyramids The Basics:
Notice the following points about pyramids: Normally males are on the left and females are on the right. Age categories are in 5 year intervals labeled up the center. The horizontal axis is measured in numbers appropriate for the country.
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Reading Population Pyramids
Shape of sides Concave sides indicate a high death rate and convex sides indicate a low death rate. This population pyramid exhibits concave sides indicating a high death rate. Width of the base Birth rate varies with the width of the base. A wide base indicates a high birth rate and a narrow base indicates a low birth rate. Bumps in the sides or Symmetry Statistically speaking pyramids should be relatively symmetrical. Any asymmetry indicates a difference in the male and female population Irregularities in the sides indicate a demographic anomaly. The age group in this population pyramid represents the baby boom. This bump will travel upward as the baby boomers age.
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3 Patterns of Change
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I. Types of Population Pyramids
Negative Growth Slow Growth Rapid Growth
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A. Rapid growth Pyramids
Rapid Growth population pyramids have this triangular/pyramid shape. The wide base of this population pyramid indicates a high birth rate & the narrow top indicates a high death rate. Generally speaking an expanding population is characteristic of a lower standard of living: high birth rate due to poor access to birth control, lack of education etc.; high death rate due to poor medical care & nutrition.
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B. Slow growth Pyramids Generally speaking stable populations are characteristic of a high standard of living due to: Low birth rate due to good family planning, access to birth control, financial planning, education, etc.; Low death rate due to good medical care, nutrition, education etc.
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C. Negative Growth pyramids
Negative Growth population pyramids have a narrower base than the reproductive age population. This indicates a decreasing population trend. The low birth rate is indicative of a well developed country.
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World Economic Development Levels
7 – 10 4 - 6 1 - 3
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Development Level: 1 – 3 Generalizations: High death rate
Low standard of living Poor Health care Low Literacy Rates – Below 50% Low Per Capita Incomes - $0 – 5,000 High birth rate
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Development Level: 4 - 6 Generalizations: Medium to Low Death Rate
Improving standard of living Improving Health care Literacy Rates in the 70% to 80% Per Capita Incomes rising $10,000 - $40,000 Birth rate Declining
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Development Level 7 - 10 Generalizations: Low Death Rate
High standard of living Very good Health care Literacy Rates in the 90’s Per Capita Incomes $30,000 – and above Low Birth rate
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Dependent Populations
Productive Population
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Average Monthly Temperature
Average Monthly Precipitation
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