AP Environmental Science / Unit 3: Populations
3.6 Age Structure Diagrams
Notes
Age structure diagrams show males and females by age group.
- Pyramid (wide base): rapid growth.
- Column (straight sides): stable.
- Inverted (narrow base): declining.
Practice
A wide base on an age-structure diagram means:
Many young people.
Japan's diagram has a narrow base. Its population is likely:
Few children.
A diagram with nearly equal age groups suggests:
Replacement level.
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