1. Explain the population explosion in sub-Saharan Africa. Why is most of the growth projected to be in this region and not in India or China? Be sure to use vocabulary terms (natural increase rate, fertility rate, doubling time) in your response.

2. Why do the two groups, the United Nations and the IIASA, differ on their projections for the growth of the world’s population, and how much uncertainty exists?

What's erosion? a. the breakdown of rock into smaller pieces b. the removal of weathered products from rock c. a change in rock resulting from exposure to water d. a chemical change in rock that weakens it

Based on what you know about the location of the earth in relation to the sun, why is this called the goldilocks zone in other galaxies? a. it's a region that exhibits a weak gravitational pull, thus maintaining a safe distance from the sun. b. it's an area that doesn't experience any major weather events that could cause mass extinctions. c. it's an area that's an optimal distance from the sun for potentially supporting life. d. it's a region that's unaffected by asteroid or meteor impacts.

While viewing a topographic map, you notice a region in which the contour lines are very close together. what can you conclude about this region? a. it has a high population. b. it has a steep incline. c. it's near a political boundary. d. it contains a body of water.