Geography Homework Help! Population Pyramids?
Please can you help me with these questions. I have no idea how to even start answering them or how to describe the population structure. Thanks in advance!
- PaladinLv 51 decade agoBest Answer
A population pyramid, also called age-sex pyramid and age structure diagram, is a graphical illustration that shows the distribution of various age groups in a population (typically that of a country or region of the world), which normally forms the shape of a pyramid. It typically consists of two back-to-back bar graphs, with the population plotted on the X-axis and age on the Y-axis, one showing the number of males and one showing females in a particular population in five-year age groups (also called cohorts). Males are conventionally shown on the left and females on the right, and they may be measured by raw number or as a percentage of the total population.
A great deal of information about the population broken down by age and sex can be read from a population pyramid, and this can shed light on the extent of development and other aspects of the population. A population pyramid also tells the council how many people of each age range live in the area. There tends to be more females than males in the older age groups, due to females' longer life expectancy.
Types of population pyramid
Population pyramids for 4 stages of the demographic transition modelWhile all countries population pyramids differ, three types have been identified by the fertility and mortality rates of a country.
Stationary pyramid - A population pyramid showing an unchanging pattern of fertility and mortality.
Expansive pyramid - A population pyramid showing a broad base, indicating a high proportion of children, a rapid rate of population growth, and a low proportion of older people. This wide base indicates a large number of children. A steady upwards narrowing shows that more people die at each higher age band. This type of pyramid indicates a population in which there is a high birth rate, a high death rate and a short life expectancy. This is the typical pattern for less economically developed countries, due to little access to and incentive to use birth control, negative environmental factors (for example, lack of clean water) and poor access to health care.
Constrictive pyramid - A population pyramid showing lower numbers or percentages of younger people. The country will have a greying population which means that people are generally older.
- Anonymous1 decade ago
A population pyramid is a pyramid that shows ages and sexes. The older people will be at the top and the younger people will be at the bottom. Countries with higher birth rates will have wider bases at the pyramids. The ones that have lower population births have narrower bases.Source(s): Can you answer mine? http://answers.yahoo.com/question/index?qid=200811...
- KristaLv 44 years ago
ii) because there are lots of babies being born, it is very wide at the bottom. this could be because of the lack of resources to have a healthy pregnancy, or lack of contraception. In Kenya, the infant mortality rate (rate of children dying) is high, so the bars gradually go inwards further up the graph. at the top, it is quite narrow which means that there are less people living to an elderly age. this could be because health care is not as good in kenya, so the age expectancy is lower than in countries such as the uk. not sure about the second one. hope that helps :)
- 1 decade ago
i don't care
hoped that helpd