What is a population pyramid?

A population pyramid is a graphical representation of age group distribution in a population, which effectively visualizes demographics. This type of diagram typically displays the percentage or number of individuals within various age categories, often separated by gender. The shape of the pyramid can indicate demographic trends, such as birth rates, death rates, and overall population growth or decline.

For instance, a population pyramid with a wide base suggests a high birth rate, indicating a youthful population, while a more narrow base may suggest fewer young people and potentially an aging population. By studying these patterns, geographers and demographers can derive insights into societal structure, potential future trends, and the needs of the population, such as healthcare or education.

Other choices focus on different concepts: biodiversity charts assess the variety of life forms within a given area; trade demographics are concerned with economic factors affecting commerce; and maps of population density visualize how population is spread across a geographical area. Each of these serves distinct purposes that are not directly related to age group distribution.