Explain the three types of population …

There are three types of population pyramids:

1. Expansive Pyramid

It is triangular in shape wherein each age group displays a bar shorter than the one preceding it, symbolising that more people die as we progress through the pyramid. A large base indicates a high birth rate. The tapering top of the graph indicates the lesser life expectancy of a region.

2. Constrictive Pyramid

With a slight reduction in the younger group of age, it is the opposite of expansive pyramid. Life expectancy is higher and living conditions are better indicating a high number of older citizens. Despite this, a decrease in population is seen due to fewer birth rates compared to the death rate.

3. Stable Pyramid

It is rectangular in shape indicating an equal distribution of people across all age groups. A slight tapering at the top denotes more death occurring among the older people, which is natural. A stable birth rate indicates the use of birth control measures. Life expectancy in such regions is high due to better living conditions, availability of medical services etc.