1. What are three causes of dry climates?

2. Give two examples of human activities that contribute to desertification.

3. What do the terms "stress" and "strain" mean?

4. A rock can be deformed by (a) compression, (b) extension or (c) shear forces. Describe the possible results for each.

5. Where can we find ice sheets today? (Give at least two examples.)

6. What makes a glacier flow? Compare this with what makes a glacier retreat?

7. Some evidence of the former existence of continental glaciers can be found in parts of Africa and South America that are many thousands of miles from the South Pole. Explain that! Do you think glacial ice extended all that distance? What could cause that to happen? Or, is there another explanation?

8. Describe briefly the global pattern of earthquakes on Earth. What parts of the globe are earthquake-free? Why?

9. What is the difference between the focus and epicenter of an earthquake?

10. Consider the world's greatest earthquakes. Is there a good correlation between earthquake magnitude and property damage or human lives lost? Why or why not? Explain. What other factors might be important? Now, answer this question, but only consider the greatest earthquakes that have occurred in the United States.