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World population 4.1

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Transcript

  • 1. Chapter 4 Section 1
    World Population
  • 2. Current World Population: 7 billion
  • 3. Growth Rates
    World pop is growing rapidly b/c birthrates
    have not declined as fast as death rates.
  • 4. Death Rates
    Are the number of deaths per year in 1,000 people.
    Improved diet and health care have lowered the death rate in many industrialized nations.
  • 5. Death Rate
  • 6. Birthrate
    Is 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.
  • 7. Birthrates
  • 8. 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.
  • 9. 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.
  • 10.
  • 11. Population Density
    The 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.
  • 12. 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.)
  • 13. Population Density
  • 14. 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.

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