world population 4.1
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Chapter 4 Section 1
World Population
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Current World Population: 7 billion
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Growth RatesWorld pop is growing
rapidly b/c birthrateshave not declined as fast as death rates.
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Death RatesAre the number of
deaths per year in 1,000 people.
Improved diet and health care have lowered the death rate in many industrialized nations.
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Death Rate
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BirthrateIs the number of
births for every 1,000 people.
In economically developing countries, the birthrate is high.
In wealthy industrialized countries, the birthrate is low.
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Birthrates
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Challenges to Population Growth
World food production has risen to meet the demands on every continent except Africa.
However, rapidly growing populations are facing shortages of freshwater, housing, and clothing.
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Negative population growth
In some countries, the death rate is higher than the birthrate.
Countries like this often recruit workers from other countries to supplement their workforce.
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Population DensityThe Earth’s people are
not evenly distributed over available land.
Most live by freshwater sources and in temperate climates.
Population density measures the average number of people living on a square mile of land.
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Population Density Continued
Population density formula:
Population of a country
Total land area of a
country
Canada: 8 ppl per sq. mi. Bangladesh: 2,401 ppl per sq. mi.
Belgium and Niger both have a population of 10.3 mil. But, Belgium is smaller (872 ppl per sq. mi.) and Niger is larger (21 ppl per sq. mi.)
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Population Density
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Population Movement (migration)
More people are moving to urban areas looking for better jobs, education, and healthcare.
½ the world’s ppl live in urban areas.
Ppl also migrate from other countries for greater economic opportunities and political freedom.