12 terms

Population pyramids GCSE

Population pyramids from http://www.coolgeography.co.uk
Stage 1 High Fluctuating
A very wide base and a very narrow top representing few old people. The profile is CONCAVE
Stage 2 Early expanding
Pyramidal in shape, with a wide base and few people surviving to old age
Stage 3 Late expanding
The top of the pyramid is pyramidal, but the base starts to even out as birth rate starts to stabilise
Stage 4 Low fluctuating
Straight sided with people living to an old age
Stage 5 natural decrease
Base narrows showing declining birth rate, many people live to an old age
Stage 1 high fluctuating image
Stage 2 Early expanding image
Stage 3 late expanding image
Stage 4 low fluctuating image
Stage 5 natural decrease image
Population pyramid
A graph showing the age and gender structure of a country
Baby boom year
A year when an abnormally high number of babies are born