Key Issue 1 Define the following terms: Ecumene, Arithmetic Density Physiological Density, Agricultural Density Questions to answer: 1. In what regions is most of the world’s population clustered? Describe the similarities of those regions. How is Europe different from the other regions? 2. Where is the largest population cluster in North America? What percentage of the world’s population lives there? 3. Where is the largest population cluster in Africa? What percentage of the world’s population lives there? How is this cluster different from the North American cluster? 4. How does climate/physical geography affect the ecumene? How do the following climate/physical geography conditions affect the population? a. Dry Lands b. Wet Lands c. Cold Lands d. High Lands 5. Why would geographers prefer to measure Egypt’s Physiological Density instead of its Arithmetic Density? 6. How can we use agricultural density to measure an area’s level of development?