Population momentum is the tendency for population to grow despite a fall in the birth rate or fertility levels. It is also the tendency for a population to continue to fall despite a rise in the birth rate.
— IB Geography Course Book (Nagle & Cooke)

Population momentum occurs because of a relatively high concentration of people in the pre-childbearing age and childbearing years. As these young people grow older and move through their reproductive years, the greater number of births will exceed the the number of deaths in the older populations, and so the population will continue to grow.

Source: IB Geography Textbook (Nagle)

 
 
 

Examine the differences of population momentum in Bangladesh, Uganda and Germany.

 
 
 

Exam Question

Distinguish between a population projection and population momentum. (2 marks)