- 1. It took 1649 years for the world population to double, going from .25 billion people to .50 billion people. How long did it take for the population to double once again? 100 years (from 0.5 billion in 1650 to 1.0 billion in 1850)
- 2. How long did it take for the population to double a second time? 75 years (from 1.0 billion in 1850 to 2.0 billion in 1925). A third time? 50 years (from 2.0 billion in 1925 to 4.0 billion in 1976)
- 3. Use a different color to extend your graph to the year 2015. In what year will the population reach 10 billion? Approximately 2025
- 4. Based on your graph, how many years will it take for the population of 2000 to double? Approximately 45 years (from 6.0 billion in 2000 to 12.0 billion around 2045)
- 5. The graph illustrates exponential growth. Based on the properties of this graph, what does this term mean? Exponential growth means the population increases at an accelerating rate over time; the time it takes for the population to double becomes shorter with each subsequent doubling.
Parent Tip: Review the logic above to help your child master the concept of human population growth worksheet.
