GEOG 130 2015 Population Geography Weeks 5 and 6 Final Part 2 for lecture Post.pptx

GEOG 130 2015 Population Geography Weeks 5 and 6 Final Part 2 for lecture Post.pptx

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III: Why does Population Composition Matter? Key Question: How do we illustrate population composition?
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Composition of a Population Age and Sex Structure: Fertility and mortality vary significantly with age. Growth of a population is affected by age composition of population
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Composition of a Population STAGE II, III STAGE IV STAGE V
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Population Pyramids – Charts that show the percentages of each age group in the total population, divided by gender For poorer countries, the chart is shaped like a pyramid. Infant mortality rates are high, life expectancy is shorter.
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Age and Sex Structures: Population Pyramids A graphic representation of a population’s age and sex composition Constructed by joining 2 back-to-back bar graphs (male and female) Provides a ‘snapshot’ of both characteristics Can identify significant demographic events (e.g. epidemics, warfare, improvements in survival)
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Population pyramids (age/sex pyramids) A simple and useful way to examine the age and sex structure of a population A pyramid is two bar-graphs back to back Pyramids present “the demographic history of an area over two or three generations”
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Population Pyramids Conventions Males on left and females on right Youngest at base of pyramid Either single or five year (more common) cohorts Last cohort (80+) may be left out Bottom scale either absolute numbers or percentages The choice of scales affects the shape of the pyramid
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Cohorts = 5 years; Scale (absolute here, in millions); males on left, females on right;
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