Where was Lake Agassiz?
Cause? Extent? Why has it disappeared? Why did its existence benefit the region form- erly covered by it? 8. Account for the great lakes of Africa. Name two of them. 9. Account for the large salt lakes in S. W. Asia. Com- pare the area of the Caspian Sea with that of Lake Superior. 10. Are the bottoms of the Great Lakes of North America above or below sea level? Explain probable cause. 11. What are the causes which lead to the disappearance of lakes? 12. Whence come the salts found in salt lakes? 13. How do lakes in a river course affect the flow of the river? Why? How do they affect the clearness of the water? Why? Examples. 14. Give some specific examples of the influence of large lakes upon the neighboring climate and industries, e. g. upon the fruit growing. 15. Discuss the importance of the great lakes to oftr iron and steel industry. 16. What points on lakes seem to be favorable sites for the growth of cities? Explain. Give examples. 17. Account for the early growth of Buffalo an
