Population Density: the average number of people are spread out over a given area - it is measured in people per square Km
Population densities can be 'sparesly' or 'densely' populated, this means an area of land has a low or high popultion density
Why do we need to know population densities?
Having an ideal population density gives us an optimum population which means there is an ideal number of people for the resources available. It enables us to see if a country has a sustainable population
Population Distribution is similar to population Density, however it is the way people are spread out over a given area
Places with many people usually have habitable environments and are usually MEDC. Large populations can be found in accessible areas with good resources and these include fertile soils for farming, good supply of raw materials
Places with a sparse population usually have hostile environments e.g. The Sahara Desert and Antarctica. Hostile environments are places without important resources with extreme temperatures
The worlds population is growing very rapidly
The worlds popuation has increased hugely, not only is this important but the rate of increase is also increasing which has lead to a 'population explosion'. The reason for this is due to a decrease in death rate which is because of better health so people live longer.
- Birth Rate: Number of babies born per 1000, per year in a country
- Death Rate" Number of deaths per 1000, per year in a country
- Migration: Movement from one area to another
- Emigration: Movement out of one area
- Imigration: Movement into a new area
Remember: The difference between birth and death rate can be classified as natural increase or natural decrease.
A population pyramids are used to show a countries population structure. The pyramid is slpit into two sections; Male's shown on the left and Female's shown on the right
- A population pyramid for and MEDC is rectangular shape. This is due to low borth rates and higher life expectancies than LEDC countri
- A population pyramid for a LEDC is a typical pyramid shape, this is because of the high borth rates and lower life expectancies (due to poorer health)
Population dependency is the ratio comparing the amount of people of working age (16 - 64) who are supplying the country with an income with the number ofdependants (under 16 and those over 65).
A high population dependency can cause global problems. Young dependencies tend to be high in LEDC's due to high brith rate, whilst high depedencies in MEDC's tend to be the older ages due to a higher life expectancy
There are THREE types of migration:
- International migration – when people move from one country to another.
- Regional migration – when people move between region of the same country.
- Local migration – when people move a short distance within the same distance.
There are also THREE different names we give to the individual taking part in the migration:
- EMIGRANT – the name of someone moving out of a country.
- MIGRANT – the person doing the moving.
- IMMIGRANT – the name of somebody moving into the country.
Hope this helped :D