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theme A (unit 2) - Coggle Diagram
theme A (unit 2)
population pyramids
Population pyramids show the structure of a population by comparing relative numbers of people in different age groups.
Population structures differ markedly between Less Economically Developed Countries LEDCs and More Economically Developed Countries MEDCs.
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Usually pyramids are drawn with the % of male population on the left and % of female population on the right.
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A population pyramid tells us how many dependants there are. There are two groups of dependants; young dependants (aged below 15) and elderly dependants (aged over 65).
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Many LEDCs have a high number of young dependants, this means that the pyramid will have a wide base and the sides of the pyramid will decrease as fewer people will reach old age
However, many MEDCs have a growing number of elderly dependants, this will be shown by the pyramid having straight sides or a barrel shape. The pyramid will also be much taller.
migration
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Migration can take place over short or long distances and it can be a one-way movement or temporary.
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why do people migrate
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A refugee is someone who has left their home and does not have a new home to go to. Often refugees do not carry many possessions and have no idea of where they may finally settle.
physical barriers
Economic migrants will often arrive by aeroplane, but refugees, asylum seekers and illegal immigrants might all try to find the easiest way to cross a border.
From 2015 to the present, a huge number of illegal migrants have journeyed across the Mediterranean Sea to get to Greece, Turkey, Italy or Spain.
Many of these people might already have made their way across deserts or mountain ranges to escape persecution, conflict or war.
These physical barriers can be difficult to cross and many people are intercepted and returned to their place of origin.
human barriers
Documentation is required to allow migration. Within the European Union (EU) migrants only need a passport. However, to migrate into other countries long application processes for visas or work permits are necessary.
Each country will have a specific set of rules about how many visas they give out each year or the type of skills and qualifications that someone might need to have.
refugees
A refugee is a person who is fleeing from things such as civil war or a natural disaster but not necessarily facing persecution.
The United Nations defines a refugee as,
A person who cannot return to his or her own country because of a well-founded fear of persecution for reasons of race, religion, nationality, political association or social grouping.
case study: Greece
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basic facts
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refugees travel via turkey from syria, as well as afghanistan and iraq tp get to europe, fleeing from war zones
240,000 arrived in january-august 2016. about a quarter of these were children
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demographic transition model
The demographic transition model shows population change over time.
It studies how birth rate and death rate affect the total population of a country. It shows marked differences between LEDCs and MEDCs.
As populations move through the stages of the model, the gap between birth rate and death rate first widens, then narrows.
In stage 1 the two rates are balanced. In stage 2 they diverge, as the death rate falls relative to the birth rate.
In stage 3 they converge again, as the birth rate falls relative to the death rate.
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stages in detail
stage 1
Total population is low but it is balanced due to high birth rates (36/37 per 1,000) and high death rates (36/37 per 1,000). Countries at this stage will usually be undeveloped.
stage 2
Total population will start to rise because the death rates will start to fall (to around 18/19 per 1,000). Birth rates will remain high. Death rates fall due to:
medical care will be improved (vaccinations, scientific improvements, doctors and new drugs);
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stage 3
Total population is rising rapidly. The gap between birth and death rates will narrow. Natural increase is high. Death rates will now remain low and steady (to 15 per 1,000) but birth rates will fall quickly (down to around 18 per 1,000). Birth rates fall due to:
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much lower infant mortality rates will mean that more children will survive and there is less need to have as many babies;
increased opportunity for employment in factories means that fewer people (and children) are required to work on the land;
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changes to equality mean that women are increasingly in the workforce and not ‘staying at home’ to look after the children.
stage 4
Total population is high and growing slowly. It is balanced by a low birth rate (15 per 1,000) and a low death rate (12 per 1,000). Contraception is widely available and there is a social desire to have smaller families.
stage 5
Total population is still high but starting to decline due to the birth rate falling (to 7 per 1,000) below the death rate (9 per 1,000). The population will start to fall as it is no longer replacing itself. The population is ageing and will gradually be dominated by older people.
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