1.6 Human Population.

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What two major events have lead an explosion in the human population?
1) The development of agriculture 2) the development of manufacturing and trade that created the industrial revolution.
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What factors can affect the growth and size of human populations?
Birth and death rates and migration.
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What is immigration?
Where individuals join a population from out side
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What is emigration?
When individuals leave a population.
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What is the equations for population growth?
population growth= ( births + immigration ) - ( deaths - emigration)
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What factors can affect birth rates?
1) Economic conditions - low per captia income tend to have higher birth rates 2) Cultural and religious backgrounds 3) social pressures and conditions 4) birth control 5) political factors
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What factors affect the death rate?
1) age profile- higher proportion of old people higher death rates are likely to be 2) life expectancy at birth 3) Food supply 4) safe drinking water and effective sanitation 5) medical care 6) natrual disasters 7) war
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What is a demographic transistion?
When in well economically developed countries there has been a large increase in life expectancy. So where their birth rates high but life expectancy low has changed to life expectancy long and birth rates low.
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Is the " average life expectancy"?
the age at which 50% of the individuals in a particular population are still alive.
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Card 2

Front

What factors can affect the growth and size of human populations?

Back

Birth and death rates and migration.

Card 3

Front

What is immigration?

Back

Preview of the front of card 3

Card 4

Front

What is emigration?

Back

Preview of the front of card 4

Card 5

Front

What is the equations for population growth?

Back

Preview of the front of card 5
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