Human populations

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What factors affect grow and size of human populations?
Birth rate, death rate, immigration, emmigration
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What is the equation for population growth?
(births + immigration) - (deaths + emmigration)
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What is the equation for percentage pop growth rate?
Population change during period divided by pop at start of the period x 100
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What affects birth rate?
Economic conditions, cultural/religious backgrounds, social pressures & conditions, birth control, political factors
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Equation for birth rate?
Number of births per year divided by total population of the same year x 100
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Equation for death rate?
Number of deaths per year divided by total population of same year x 100
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What affects death rate?
War, age, life expectancy, food supply, natural disasters
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Characteristics of a stable population?
Birth rate + death rate balanced; no increase or decrease in pop
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Characteristics of an increasing population?
High birth rate (wide base on pyramid); Few old people (narrow apex); LEDC
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Characteristics of a decreasing population?
Low birth rate (narrow base of pyramid); low mortality rate (wide apex); MEDC
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Stage 1 of demographic transition?
BR + DR high; small & stable pop
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Stage 2 of demographic transition?
BR high; DR low; early expansion
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Stage 3 of demographic transition?
BR + DR low; late expansion
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Stage 4 of demographic transition?
BR + DR low (balanced); large and stable pop.
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How do you calculate average life expectancy?
age at which 50% of individuals in a pop are still alive
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What does a survival curve show?
Number of people alive at a time
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Other cards in this set

Card 2

Front

What is the equation for population growth?

Back

(births + immigration) - (deaths + emmigration)

Card 3

Front

What is the equation for percentage pop growth rate?

Back

Preview of the front of card 3

Card 4

Front

What affects birth rate?

Back

Preview of the front of card 4

Card 5

Front

Equation for birth rate?

Back

Preview of the front of card 5
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