What is important when looking at population?
Structure as well as total numbers
What do population pyramids represent?
The number of people in each age group and how those numbers are changing
What does a wide base in a population pyramid indicate?
A young population
What does wider bars at the top of a population pyramid indicate?
An ageing population
What can a longer than expected bar in a population pyramid indicate?
A large amount of immigration at that age range
What may a shorter than expected bar in a population pyramid be due to?
War or famine