population pyramids

• population pyramid

  a graph showing the structure of a population by comparing the relative numbers of people in different age groups
• wide bottom

  many children being born (dependant population) Wide middle = many in work (economically active)
• wide top

  many surviving to old age (dependant population)
• short pyramid

  suggests short life expectancy, possibly due to illness
• tall pyramid

  good healthcare so people live a long life
• dependent population

  Ages (under 15 and over 64 years) who depend on others for support
• economically active

  People aged (between 15 - 64 years) who are therefore of working age