Population Flashcards
Population distribution
the way in which a population is spread over an area. This usually requires a description.
Population density
the number of people per specified area, for example, population per kilometre squared. This will be a figure, for example, 78 people/km2
Birth Rate - Death Rate
= Natural Change
Stage 1
Birth rates and death rates are high so population is low and stable. (Rainforest Tribe)
Stage 2
Death rates fall but birth rates remain high. Natural increase is greater so population starts to grow rapidly. An example would be Sri Lanka or Peru.
Stage 3
Birth rates now fall and death rates continue to fall. Natural increase is still high and population growth rapid. An example would be Chile or China.
Stage 4
Birth rates and death rates level out. Natural increase is low so population stabilises. Australia would be a good example of a country at the start of stage 4.
Stage 5
Birth rates fall below death rates so natural increase is now negative. Population will start to decrease. Japan and Italy are in this stage.
Pyramid 1
Here the base is very wide indicating a very high birth rate. The width drops off very quickly. This means people must be dying. Very few reach old age. Few countries are still in this stage today but some rainforest populations would display this pattern.
Pyramid 2
Still a large base so high birth rate but also a wider and taller pyramid as more people are living to older ages. This is stage two of the demographic transition model and includes many countries in Africa such as Kenya.
Pyramid 3
Note the more ‘domed’ shape. It means many people are living to older ages as quality of life improves. There are also proportionately fewer births. This is stage three of the demographic transition model. Chile would be a good example.
Pyramid 4
Very small base due to the very low birth rates and death rates displayed in the wide top. This would be representative of Australia that has recently come through stage three of the demographic transition model.
stage 2 example
Egypt, India, Kenya
stage 3 example
Brazil
stage 4 example
USA, Japan, UK, France