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What information can we get from a population pyramid?
Lack of endemic
fatal diseases
Wide spread
birth control
Desire to follow
careers
Low infant mortality
What factors influence population structure in Developed Countries (think factors that control death rates and birth rates)?
Greater equality
for females
Gently sloping sides – this suggests that there is a low Death Rate
More people in the top half of the pyramid and lower numbers of younger people – this gives a rather top heavy appearance.
Fairly wide tops – which suggests that there is a low Death Rate and high life expectancy.
Fairly narrow bottoms – which means a fairly low Birth Rate
Good levels of sanitation
Balanced and full diet
Widespread
medical care
Exit Slip: What will the population structure look like in 2050?
Many more people in the youthful pyramid base i.e. it looks more pyramid in shape
Fairly broad bases – this suggests a high Birth Rate
Steeply sloping sides as many people in each successive cohort die – this suggests a high Death Rate
Very narrow tops – this suggests a high Death Rate
Malnutrition and under-nutrition
Lack of Health
Education
High Infant mortality rates
Desire to have
large families
War
What factors influence population structure in less developed countries (again think birth and death rates)?
Lack of
birth control
Endemic and epidemic
diseases
Poor Sanitation
Lack of
medical care
Degree
of Poverty
If cohorts get smaller or larger in the pyramid then this can provide information about
The age groups are in 5 year groups & called cohorts.
Population pyramids show a cross section of a population at a particular moment.
They divide the population by gender i.e. male and female and by age.
How and why population pyramids of an LDC & an MDC are different
Any combination of these
Right side of pg. 10: LDC/MDC Population Pyramids
Changes in birth rate
Changes in the movement of people - migration
Changes in death rate