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Chapter 22-population...

Chapter 22-population... - Chapter 22 Population...

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Chapter 22- Population, urbanization and the environment Demography: the study of population Until 250 years ago the world pop. Was around 500 mil. Life span was shorter than it is now 77 million ppl added to the planet each year 6.2 billion in 2002 Demography- the study of human population Fertility The incline of child bearing in a country’s population A women could possibly bear 20 children but this poses many problems Crude birth rate- number of live births for every thousand ppl in the population o Calculated by diving the number of births by a population and multiplying it by 1000 2002, Canada- 327 882 love births with population of 30million o Crude birth rate of 10.9 Newfoundland- 8.8- low due to out migration Quebec is low because many women entered the work force Funafuti- 25.2 Mortality The incidence of death in a women population Crude death rate o Same as birth rate o Canada in 2002- 7.5 Infant morality rate- rate of death in infants in the first year of life for each thousand life births in a year o Found by dividing the number of deaths of infants by live births and x1000 o 2001-5,0 per 1000 Life expectancy- average life span of a societies population o Canadian born males in 1997 can expect to live to 76 while women can live to 81 o Life expectancy is in rich countries is 20 years longer than poor. Migration The movement of ppl into and out of a specific territory Migration is sometimes involuntary It is also due to push-pull factors o Dissatisfaction with life in poor countries is a push factor o Pull factors include attractions to big city where oppurntity is greater Immigration o Movement of people into a country.
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o In-migration rate- The number entering per every thousand ppl Emigration o The movement of people out of a country. o Out-migration rate- ppl leaving per every thousand Net-migration rate is the result of both in and out migration Population growth Affected by migration, morality, fertility Natural growth rate- subtract crude birth and death rates 2002- Canada’s natural growth rate was 3.3. Population composition One variable is sex ratio o Number of males to every 100 females o In 2001 ratio was 98 men per 100 females o Women tend to outlive men o Ratio is 1007 in India. This could be because they value males more and abort females at birth Age-sex pyramid o Graphic representation of the age and sex in population o The bulge in the pyramid of women when they’re 30 reps. the baby boom. Just below that represents the baby bust o Through age sex pyramids we can predict demographic trends History and the theory of population growth Societies desired high birth rates due to high death rates A critical point in world population growth occur din the 1750’s as the earth population turned upwards Population currently 6 billion o 1800- I billion o 1930- 2 billion o 1962-3 billion o 1974-4 billion o 1999- 6 billion o By 2050- presumed to be 7-8 billion as it gains 77 million ppl year Malthusian theory Thomas Malthus
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