Chapter 7, Problem 9CR

To determine

The main concept of the given section. The meaning of the terms surfaces water, runoff, and watershed (drainage basin), lake, eutrophication, cultural eutrophication, delta, and inland wetlands. The major services provided by freshwater systems regarding ecosystem and ecology. The four zones of the deep lakes and the difference between oligotrophic and eutrophic lakes. The name of the three zones from which a stream passes from highlands to lowlands. Examples of inland waterways and the economic and ecological importance of them. The four human activities that are destroying the freshwater system. The four ways in which Alexandra Cousteau taught the importance of aquatic systems to the people.