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By Amy Lees…read more

Slide 2

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Unit 1
Population Dynamics…read more

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Global Population
· The world population is growing at an alarming rate in 2008 at
least another 65 million people were added to the global total of
6.6 billion
· Since 2000 the rate of growth has begun to slow down
· Exponential Growth has been occurring (the amount of time
taken for the population to double e.g. in 1804 it had taken the
population 300 years to double from ½ billion to 1 billion. In 1999
the doubling time had fallen to 39 years)
Factors affecting birth and death rates
Births Immigrants
Population GAIN
Natural Migration
Change Total Population Change
Population LOSS
Deaths Out migrants…read more

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Key Terms Increasing Population
Birth Rates ­ The amount of babies Mainly due to a decline in death rates
born per 1000 of the population per and infant mortality rates:
1) Development of modern
Death Rates ­ The amount of deaths medicines. This has meant that
per 1000 of the population per year
more and more people are kept
Immigrants ­ People moving into a
country alive due to modern practices.
Emigrants ­ People moving out of a 2) Introduction of vaccination and
country immunisation programmes e.g.
Migration ­ Movement of people into smallpox vaccination that helps
and out of an area or country people live longer.
Migration Balance : - Positive more 3) Cleaner drinking water and better
immigrants than emigrants ­ increase sewage disposal, a lot more people
population have access to clean drinking water
- Negative decrease population ­ less than before.
immigrants than emigrants ­ decrease
population 4) Better healthcare ­ more doctors,
Natural Increase ­ Birth rate is higher nurses and hospital, means that
than death rate = population increase people can be treated and not die.
Replacement Level ­ The amount of 5) More hygienic housing.
babies needed to be born for the 6) Better diets, e.g. promoting eating
population to remain the same…read more

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How and why population change
Birth Rate
Low Population
fluctuates Very rapid Population
increases Very slow
but stays population slowly
but less increase
relatively increase decreases
stable…read more

Slide 6

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How and why population change
Stage 1: High Fluctuating
High birth rate due to no birth control and high infant mortality
High death rate due to disease and famine
Stage 2: Early expanding
High Birth rate
Falling death rates due to improved health care and nutrition
Stage 3: Late expanding
Falling birth rates due to birth control and wanting smaller
Falling death rates
Stage 4: Low fluctuation
Low birth and death rates due to working women delaying age
to start their families
Stage 5: Decline
Death rate higher than birth rate due to a `grey' population…read more

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