Unit G2 1.1 What is Demographic Change?

1.1 What is demographic change?

• demographic change = the net change in the population store caused by the inputs of birth and in-migration and the ouputs of death and out-migration
• migration = the movement of people in and out of an area
• Population distribution = the way in which a population is spread over an area
• Population density = the number of people per specified area (can be shown on a choropleth map)
• global population is increasing by 2.7 people per second
• 95% of growth is in the less developed world
• 1 in 3 people are aged under 15

Population growth:

• 1820 - 1 billion
• 1970 - 3 billion
• 1999 - 6 billion
• population growth is now rapid, approximately +1 billion people every 15 years

Factors affecting population growth:

• Relief (how high land is) e.g. Himalays have low population, Nile Delta has higher as it is low, flat ground
• Vegetation (can prevent…