Population change

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How has global population changed?

The worlds population is incresing, described as the "population explosion" because of the high birth rates, low death rates and migration.

The population has rapidly increased over the past 200 years.

There was a baby boom after the second world war so the population is ageing, and a small dependant population.

The population can be maesured in population pyramids so that we can see how many elderly dependants, youthful dependants and economically active there are

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Where are the changes taking place?

In some parts of the world the infant mortality rates are high, like in Africa because more children are needed for jobs, like farming.

Asia and Africa has the fastest population increase because they aren't educated as well as developed countried.

In Tanzania therer is a high infant mortality rate and the average amount of children per family are around 10-15.

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Why is it difficult to predict the future changes?

It is hartd to predict the future changes because there might be a change in birth rates because some places might introduce the one child policy.

But it could also change because the amount or resources in developing countried might be getting better so life expectancy will go up.

This could also mean that if there are even less resources then the popultion will decrease.

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What is the demographic transition model?

The Demographic transition model is used to show how the structure of the population is changing using the variations of births and deaths in a country. (DTM)

 

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What does the DTM show us?

Stage 1 is called the high stationary stage where there is a high birth and death rate.

Stage 2 is called the early expanding stage where the birth rate is high but the death rate is falling rapidly.

Stage 3 is called the late expanding stage where the birth rate is falling but the death rate is falling slowly.

Stage 4 is called the low stationary stage where the birth and death rate is low.

Stage 5 is called the declining stage where the birth rate is very low and the death rate is low.

(http://www.geographylwc.org.uk/A/AS/ASpopulation/demographic_transition_detailed.jpg)

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What factors can affect the birth and death rate?

Things can affect the birth and death rate such as:

  • how many children are needed for farming in a family
  • how many children die at an early age
  • religious/social encouragement
  • family planning
  • improved medical care and diet
  • status of women
  • late marrages
  • resources
  • disease/famine/illness
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Somalia case study

  The poulation in Somalia had a high birth and death rate because it was a developing country and it is a youthful population.

To change the population they should increase the amount of family planning/healthcare and the amount of contraception.

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Somalia case study

  The poulation in Somalia had a high birth and death rate because it was a developing country and it is a youthful population.

To change the population they should increase the amount of family planning/healthcare and the amount of contraception.

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Somalia case study

  The poulation in Somalia had a high birth and death rate because it was a developing country and it is a youthful population.

To change the population they should increase the amount of family planning/healthcare and the amount of contraception.

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