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
Growth Rates How would death rates ? –Better health care/ meds. –More food –Better technology –Better living conditions, sanitation (think after Industrial Revolution)
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)
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.
90% of earth's population growth occurs in less developed countries.
In Bangladesh- most densely populated country in world
Population Problems What would be problems of rapid growth? –Enough food to feed all –Resource shortages (water, housing, clothing) –Age distribution (too young)
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
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 Ecumene= portion of earth occupied by permanent human settlement Need 3 things: –Available water, fertile soil, & a good climate
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?
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
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
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.
Population Movement Migration: ppl move place to place –City to city, suburb to suburb, rural to urban
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!
Migration Between countries: –Emigrants in home country –Immigrants in new country Reasons to leave: –War, food shortages, jobs, education, oppression/ persecution, disaster