explain with the help of figure the three different type of represented by human population
Answers
Answer:
What Are Population Pyramids?
Imagine you are a sociologist studying population growth in North America. Specifically, you are interested in examining the age and sex of the population. One way in which you can accomplish this goal is to create a population pyramid.
Population pyramids are graphical representations of the age and sex of a population. For this reason, population pyramids are also referred to as age-sex pyramids. We refer to these graphs as pyramids because they are usually shaped like triangles, though as we will see shortly, population pyramids also take other shapes. Population pyramids usually have males on the left side and females on the right. There is also a vertical line in the middle of the graph that separates the males from the females.
Types
There are three types of population pyramids: expansive, constrictive, and stationary.
Expansive population pyramids depict populations that have a larger percentage of people in younger age groups. Populations with this shape usually have high fertility rates with lower life expectancies. Many third world countries have expansive population pyramids.
Constrictive population pyramids are named so because they are constricted at the bottom. There is a lower percentage of younger people. Constrictive population pyramids show declining birth rates, since each succeeding age group is getting smaller and smaller. The United States has a constrictive population pyramid.
Stationary population pyramids are those that show a somewhat equal proportion of the population in each age group. There is not a decrease or increase in population; it is stable. Austria has a stationary population pyramid.
Explanation: