41. Describe three push and three pull factors that have influenced the demographic shift from rural areas to urban areas. (10 points)

42. Describe ten specific things you can do to reduce consumption of water, energy, and or any other resource (1 point for each accurate action. Ten points possible.)

43. Define acid deposition. Which two criteria air pollutants contribute the most to acid deposition (acid rain)? Discuss the impact of acid rain on each of the following: lakes/streams, forests and building materials. (10 points)

44. Distinguish between the benefits of the ozone layer in the stratosphere and the harmful effects of ozone at ground level. (10 points)