A rapidly expanding population would be associated with a population pyramid that had an extremely broad base.
A population pyramid can be described as a kind of pyramid that represents the increase or decrease in a population based on age, gender, group, etc for a population.
A population pyramid that has a broad base represents that the concerned population is growing rapidly in that given time. On the other hand, such a population pyramid that has a narrow base represents that the population is decreasing for the given place.
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