9-1 Studying Human Populations Page 219. A. The Human Population Over Time 1. Demography is the...
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Transcript of 9-1 Studying Human Populations Page 219. A. The Human Population Over Time 1. Demography is the...
![Page 1: 9-1 Studying Human Populations Page 219. A. The Human Population Over Time 1. Demography is the study of populations.](https://reader031.fdocuments.us/reader031/viewer/2022020800/56649e795503460f94b79771/html5/thumbnails/1.jpg)
9-1 Studying Human Populations
Page 219
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A. The Human Population Over Time
• 1. Demography is the study of populations.
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A. The Human Population Over Time• 2. Industrial and scientific revolutions caused a
period of exponential growth.
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A. The Human Population Over Time
• 3. Scientists believe we can not indefinitely sustain the current population at today's standards of living.
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B. Forecasting Population Size• 1. Demographers make predictions based on
age structure (distribution of ages in a specific population at a certain time).
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B. Forecasting Population Size• 2. Survivorship is the percentage of members
of a group that are likely to survive to a given age.
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B. Forecasting Population Size
• 3. Survivorship curves show 3 possible outcomes:– Type I: Population where most individuals live to
an advanced age.– Type II: Population where all ages have a similar
death rate.– Type III: Population where many offspring die.
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B. Forecasting Population Size• 4. Fertility Rates are the average amount of
children a woman gives birth to in her lifetime.
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B. Forecasting Population Size• 5. Migration is the movement from one area
to another.
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C. Declining Death Rates
• 1. Life expectancy is the average # of years members of a population are likely to live.
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C. Declining Death Rates
• 2. The average life expectancy has increased to more than 67 yrs. Worldwide! 80 yrs. In some developed countries!
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D. The Demographic Transition
• 1. Model that describes how economic and social changes affect population growth rates.
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D. The Demographic Transition
• 2. Four Stages:– Pre-industrial– Transitional– Industrial– Post-Industrial