What Factors Affect Population?

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Presentation transcript:

What Factors Affect Population?

1. Environment People are attracted to: mild climates, fertile soil, fresh water and natural transportation routes.

Throughout history people have moved in search of a better life. 2. Migration Throughout history people have moved in search of a better life.

Immigration: is the act of coming to a new country as a permanent resident. Emigration: means leaving a home country to take up permanent residence elsewhere. An emigrant could be a Candian actor moving to the States in search of a big break. Net Migration: measures the real effect of migration on population. A positive net migration means that more people moved into the country than the number who left in the year. Formula: Immigration - Emigration ___________ Net Migration

3. Technology Technology can affect population by allowing people to make environments more livable. For example, irrigation systems in the California desert allow dry but fertile soil to produce crops. Technologies also influence human life and death, directly affecting population.

4. Natural Increase Birth Rate: the number of births per 1000 people per year Death Rate: the number of deaths per 1000 people per year Natural Increase: the birth rate minus the death rate Formula: Birth Rate - Death Rate _______________ Natural Increase

5. Government Policies Government policies can affect population, for example, China created the One Child Policy. This policy was introduce in 1979 to limit the pressure of population increase on society. This policy continues today; couples are permitted only one child. Having a second child will result in heavy fines.

Natural Increase + Net Migration _______________ Population Change

Calculate the overall population change in 2005 for these countries. Country Birth Rate per 1000 Death Rate per 1000 Net Migration per 1000 Canada 10.8 7.7 5.9 Mexico 21.0 4.7 -4.6 Mali 49.6 16.5 -6.3 Russia 9.8 14.5 1.0

http://www12.statcan.gc.ca/census-recensement/2006/as-sa/97-557/vignettes/NatHistImmig_ec.swf