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Jackie Metzger

on 22 April 2010

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Transcript of Population

Population By Jackie Metzger Demography: is the study of human population Basic demographic Concepts Fertility -is the incidence of childbearing in a country's population A women is capable of bearing more than 20 children from early teens to menopause The Duggar Family Crude Birth Rate -the number of live births in a given year for every 1,000 people in a population Mortality -the incidence of death in a country's population Infant Mortality Rate -the number of deaths among infants under the age of one Crude Death Rate -the number of deaths in a given year for every 1,000 people in a population Life expectancy -the average life span of a country's population Women typically live longer than men the deeper green state appears on this map the higher the ratio between males and females Migration "push-pull" factors are usually at work
A lack of jobs "pushes" people to move,
and more opportunity elsewhere "pulls"
people to someplace new. History of Population Large farm families more human labor = key to more productivity Until the rubber condom was invented in the mid-1800s, preventing pregnancy was uncertain at best. infectious diseases put a constant brake on population growth Malthusian Theory Thomas Malthusian calculated that population would
soon soar out of control and people reproducing beyond
what the plant could feed. He aslo believed that there
would be a widespread of starvation and war over what
sources where left. Demographic Transition Theory thesis that links population patterns to a
society's level of technological development Stage #1- rates are balanced Stage #2-they move away from each othe, as death rate falls relative to the birth rate Stage #3-they move towards each other again, as birth rate falls relative to the death rate Stage #4-Death and birth rates are balanced again united states 309,106,422
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