AP Environmental Science Flashcards: Age Structure Diagrams
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
What is the 'rule' for identifying rapid population growth from age structure?
The rule is that a rapidly growing population will have a higher proportion of younger people than a stable or declining population.
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What is the 'rule' for identifying rapid population growth from age structure?
The rule is that a rapidly growing population will have a higher proportion of younger people than a stable or declining population.
How is a population's growth rate determined from an age structure diagram?
Population growth rates can be interpreted from the overall shape of an age structure diagram.
If an age structure diagram is shaped like a pyramid with a very wide base, what can you infer about its growth?
A diagram with a wide base indicates a high proportion of younger people, which signifies a rapidly growing population.
If you are comparing two age structure diagrams, how would you identify the one representing the more rapidly growing population?
You would identify the diagram with the higher proportion of younger people, which typically gives the structure a wider base.
A country's census data reveals a very high proportion of citizens under the age of 15. What does this imply about its population growth rate?
A high proportion of younger people implies that the country has a rapidly growing population.
What is the relationship between the proportion of young people and population stability?
Compared to rapidly growing populations, stable or declining populations have a lower proportion of younger people.
What single feature of an age structure diagram is most indicative of the population's growth momentum?
The shape of the structure, which reflects the proportion of different age groups, is the key feature for interpreting population growth rates.
What is an age structure diagram?
An age structure diagram is a graphical illustration whose shape shows the distribution of various age groups in a population, which can be used to interpret population growth rates.
Term: Rapidly Growing Population (Age Structure)
This refers to a population whose age structure diagram shows a higher proportion of younger people compared to stable or declining populations.
What is the key characteristic of a rapidly growing population's age structure?
A rapidly growing population will, as a rule, have a higher proportion of younger people compared to other population types.