Ch 2 population
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Ch. 2 Population. Section #1 “People are not distributed uniformly across Earth’s surface .”. Where Is the World’s Population Distributed?. REVIEW: Population Concentrations 2/3 of the world’s inhabitants are clustered in four regions. Site and Situation of Population Clusters

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Ch. 2 Population

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Ch 2 population

Ch. 2 Population

Section #1

“People are not distributed uniformly across Earth’s surface.”


Where is the world s population distributed

Where Is the World’s Population Distributed?

  • REVIEW: Population Concentrations

    • 2/3 of the world’s inhabitants are clustered in four regions.

    • Site and Situation of Population Clusters

      • Low-lying areas with fertile soil and temperate climate

      • Near an ocean or near a river with easy access to an ocean.

      • East Asia- China(River Valley)

        • ¼ of world population

  • South Asia- India(Ganges River)

  • Southeast Asia- Indonesia

  • Europe- Major Rivers


Cartogram countries by size

Cartogram: Countries by size


Where is the world s population distributed1

Where Is the World’s Population Distributed?

  • Sparsely Populated Regions

    • Humans avoid clustering in certain physical environments.

      • Dry Lands

      • Wet Lands

      • Cold Lands

      • High Lands

    • Places considered too harsh for occupancy have diminished over time.

      • Places of permanent human settlement are termed the ecumene.


Population density helps geographers describe the distribution of people in comparison of recourses

Population DensityHelps Geographers describe the distribution of people in comparison of recourses.

  • Density can be computed in up to three ways for a place.

    • Arithmetic Density

    • Physiological Density

    • Agricultural Density


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Arithmetic Density*Total number of objects in an given area*Computation: Divide the population by the land areaThink about: # people trying to live on a given piece of land


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Physiological Density*Number of people supported by a unit area of arable land*Computation: Divide the population by the arable land area*Think about: Does the land give enough food for needs


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Agricultural Density*Ratio of the number of farmers to amount of arable land*Computation: Divide the population of farmers by the arable land area*Explains economic differences


Why is global population increasing

Why Is Global Population Increasing?

  • Components of Population Growth

    • Geographers measure population change in a country or the world as a whole by using three measures:

      • 1. Crude Birth Rate (CBR)– total number of live birth in a year for every 1,000 people alive in society.

      • 2. Crude Death Rate (CDR) – total number of deaths in a year for every 1,000 people alive in society.

      • 3. Natural Increase Rate (NIR)– percentage by which a population grows in a year.


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  • Computation: CBR – CDR = NIR

    • Remember NIR is a percentage ( n per 100, while CBR and CDR are expressed as n per 1,000)

    • Why “Natural”? Excludes migration

  • Video

  • http://www.youtube.com/watch?v=WY6FZjBC1kc


  • Components of population growth

    Components of Population Growth

    • Example:

      • Natural Increase

        • About 82 million people are added to the population of the world annually.

        • Rate of natural increase affects the doubling time– number of years needed to double the population, assuming a constant rate of natural increase.

          • Calculating Doubling Time: 70/NIR=Time

          • Twenty-First Century Rate (1.2 percent): 54 years

            • Global population in 2100 would reach 24 billion.


    World average 1 2 percent highest in africa and sw asia lowest in europe and japan why

    World average= 1.2 percentHighest in Africa and SW AsiaLowest in Europe and JapanWHY?


    Components of population growth1

    Components of Population Growth

    • Fertility-Total Fertility Rate (TFR)

      • Defined as the average number of children a woman will have throughout her childbearing years (15–49)

        • TFR for world is 2.5.

        • TFR exceeds 5 in sub-Saharan Africa, while 2 or less in nearly all European countries.

          WHY?


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    • Mortality-Infant Mortality Rate (IMR)

      • Defined as the annual number of deaths of infants under one year of age, compared with total live births

      • Usually expressed per 1,000 births rather than a percentage

      • IMR is 5 in developed countries and 80 in sub-Saharan Africa.

      • WHY?


    Summary of spatial patterns

    Summary of Spatial Patterns

    • Developed Countries

      • Lower rates of…

        • Natural increase

        • Crude birth

        • Total fertility

        • Infant mortality

    • Developing Countries

      • Higher rates of…

        • Natural increase

        • Crude birth

        • Total fertility

        • Infant mortality

          Video: http://www.youtube.com/watch?v=qb-3Ri5G2j4


    Population structure

    Population Structure

    • A special bar graph known as a population pyramid can visually display a country’s distinctive population structure.

      • X-axis

        • Percent male displayed to the left of zero

        • Percent female displayed to the right of zero

      • Y-axis

        • Age cohorts typically grouped in 5-year intervals

        • Youngest displayed at bottom and oldest at top


    Population pyramid 2 main features

    Population Pyramid2 Main Features

    • Dependency Ratio

      • Number of people who are too young or too old to work, compared to the number of people in their productive years.

        • People aged to 14 and over 65 years old are considered dependents.

        • Larger dependency ratios imply greater financial burden on the working class.

        • Calculate: % under 15 + % over 65/ % aged 15 – 64 x 100

          • 85 percent in sub-Saharan Africa, while 47 percent in Europe.

    • Sex Ratio

      • Number of males per 100 females in the population

        • Developed countries have more females than males, because they tend to live 7 years longer.


    Population pyramids for poor countries

    Population Pyramids for Poor Countries

    • -High infant mortality-High Youth Dependency+Youthful Pop-Creativity

    • -Short life expectancy-Strain on Resources+Less Elder Dependency

    • -Fewer Women Educated+Large Workforce


    Population pyramids for wealthy countries

    Population Pyramids for Wealthy Countries

    • +Low infant mortality-High Elder Dependency Rate

    • +Long life expectancy-Possible labor storages

    • +Educated Workforce+Low youth dependency rate

    • +More Females then Males


    Ch 2 population

    Stop


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