Name three types of population pyramids?

1. Expansive population pyramid: This type of population pyramid has a wide base, indicating a high proportion of young people in the population. It typically indicates a high birth rate and a high population growth rate.

2. Constrictive population pyramid: This type of population pyramid has a narrow base, indicating a low proportion of young people in the population. It typically indicates a low birth rate and a low population growth rate. This type of pyramid is often associated with developed countries with low fertility rates.

3. Stationary population pyramid: This type of population pyramid has a relatively equal distribution of population across all age groups. It typically indicates a stable population with a relatively balanced birth rate and death rate. This type of pyramid is often associated with countries that have reached a demographic transition, where birth and death rates are low and population growth is minimal.