World Population

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

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

Growth Rates Life expectancy- average number of years ppl live w/ in a given population Fertility rate- # of babies a woman is expected to have in her life 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

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.

Nairobi, Kenya Mumbai, India

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

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

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

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

In Bangladesh- one of most densely populated countries in world

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 fertile land –181 ppl/sq. mile vs. 5,807 ppl/sq. mile

Migration Between countries: –Emigrants in home country –Immigrants in new country Reasons to leave: –Push vs. Pull Factors

Migration Urbanization – movement from rural areas to cities Half the world’s population lives in cities Refugees – people that leave their home country because of wars, food shortages, or other problems

Population Pyramids

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