The chart shows world population milestones by year.

Question

A 2-column table with 7 rows titled World Population Milestones. Column 1 has entries 1 billion, 2 billion, 3 billion, 4 billion, 5 billion, 6 billion, and 7 billion. Column 2 is labeled year with entries 1804, 1927, 1960, 1974, 1987, 1999, and 2011.

During which time period did it take the longest for the global population to increase by one billion people?

1804–1927
1927–1960
1960–1974
1974–1987

Answer 1

To determine which time period took the longest for the global population to increase by one billion people, we can look at the intervals between the milestones:

• 1804 to 1927: 123 years (from 1 billion to 2 billion)
• 1927 to 1960: 33 years (from 2 billion to 3 billion)
• 1960 to 1974: 14 years (from 3 billion to 4 billion)
• 1974 to 1987: 13 years (from 4 billion to 5 billion)

The longest time period for the global population to increase by one billion people was from 1804 to 1927, which took 123 years.