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World Population Ch. 4 Sec. 1. Demography The study of population -#’s -Ethnicities -Common characteristics -Distribution/ Density.

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Presentation on theme: "World Population Ch. 4 Sec. 1. Demography The study of population -#’s -Ethnicities -Common characteristics -Distribution/ Density."— Presentation transcript:

1 World Population Ch. 4 Sec. 1

2 Demography The study of population -#’s -Ethnicities -Common characteristics -Distribution/ Density

3 The study of human populations, including their size, growth, density, distribution, and rates of births, marriages, and deaths. Demography

4 According to the United Nations, the World reached 6 billion people on October 12, 1999.

5 Population Growth 1000-1800: 1 billion ppl 1800-1950: 2 billion ppl –Doubled in 150 yrs 1950-2000: 6 billion ppl –Tripled in 50 years By 2050: 9 billion ppl!!


7 Between 1800 and 1950, the world population doubled, reaching 1 billion. We reached 6 billion in 1999. At its current rate, we will pass 9 billion by the year 2050.

8 Frank and Ernest on Population

9 Frank and Earnest on Population Explosion

10 Growth Rates Death rate: # of ppl that die every year per 1,000 Birth rate: # of ppl born every year per 1,000 Natural Increase (growth rate)= BR – DR

11 Frank and Earnest on Birthrate

12 Growth Rates Life expectancy- average number of years ppl live w/ in a given population Fertility rate- # of live births per 1,000 ppl (avg. amount of children/family) Infant mortality rate- # of deaths of infants under 1 yr. per 1,000 live births Child mortality rate- # of deaths of children ages 1-5 per 1,000

13 Growth Rates How would death rates ? –Better health care/ meds. –More food –Better technology –Better living conditions, sanitation (think after Industrial Revolution)

14 Growth Rates Zero Population growth occurs when BR = DR –Usually happens only in wealthy countries –Most rural areas have tradition of many kids (farm work)

15 Growth Rates Doubling time: –# of yrs. it takes a pop. to double in size –Parts of Asia, Africa, Latin Am. = 25 yrs. –Wealthy countries = 300 yrs.

16 90% of earth's population growth occurs in less developed countries.

17 In Bangladesh- most densely populated country in world

18 Population Problems What would be problems of rapid growth? –Enough food to feed all –Resource shortages (water, housing, clothing) –Age distribution (too young)


20 Nairobi, Kenya Mumbai, India




24 Population Positives What are good things that come with growth? –Levels of technology/creativity rises Adv. in agriculture help food prod. –Enough workers to keep economy going

25 Negative Pop. Growth Occurs when DR > BR –Not enough workers –Labor must be brought in  problems b/w different cultures

26 Population Distribution Pop. Dist. = pattern of human settlement Due to inhospitable land, ppl only live on 1/3 of Earth’s land Ecumene= portion of earth occupied by permanent human settlement Need 3 things: –Available water, fertile soil, & a good climate

27 Which continents are the most densely populated? What regions tend to be the least populated- think climate? Which is more populated- urban areas or rural areas?

28 Population Density Pop. Dens.= ppl per sq. mile –Total population / total land area (arithmetic pop. dens.) Some countries have wide open areas= low pop. dens. Some are tinier countries= high pop. dens. –Ex: Belgium & Niger

29 Population Density Uneven distribution- not all land is usable –Egypt: 99% of pop. lives w/in 20 miles of Nile  the rest is desert –Use physiological pop. dens. = Total population / total arable land –181 ppl/sq. mile vs. 5,807 ppl/sq. mile

30  Based on total land = 181 people per square mile. Egypt’s Pop.Density  Based on arable land = 5807 people per square mile. 99% of Egyptians live within 20 miles of the Nile River.

31 Population Movement Migration: ppl move place to place –City to city, suburb to suburb, rural to urban

32 Urbanization What are reasons to move to the city? –Jobs –Education –Land goes bad –Health care/ social services ½ of world’s population lives in cities!

33 Migration Between countries: –Emigrants in home country –Immigrants in new country Reasons to leave: –War, food shortages, jobs, education, oppression/ persecution, disaster

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