GEOG 335 Study Guide - Midterm Guide: Zero Population Growth, Doubling Time, Population Momentum

• School: University of Maryland
• Department: Geographical Sciences
• Course: GEOG 335
• Professor: Mila Zlatic

Document Summary

Lecture 1, 2, and 3: population growth and change. Populations in the world have gone through some important changes over the years (particularly, the numbers have increased immensely since the industrial revolution. Agricultural revolutions are also periods of population growth) Population growth is influenced by: the number births exceeding the number of deaths, migration flow is positive. Low life expectancy during the hunting-gathering phase. More than half of newborn children died at age 5. Women that survived long enough to get pregnant would have to bear 7 children in hopes that 2 of them would survive to achieve adulthood. It took a very long time to increase life expectancy before the industrial revolution. Decline in death rates due to improvements in human conditions. Access to health technology like vaccines since world war 2. In 2009, world life expectancy has increased to 68 years according to world health.