Environmental Science 15th Edition by Scott Spoolman,Tyler Miller

تمرين 18

What is the key concept for this section? Define surface water , runoff , and watershed (drainage basin). What major ecosystem and economic services do freshwater systems provide? What is a lake ? What four zones are found in deep lakes? Distinguish between oligotrophic and eutrophic lakes. What is cultural eutrophication ? Describe the three zones that a stream passes through as it flows from highlands to lower elevations. What is a delta ? Give three examples of inland wetlands and describe the ecological and economic importance of such wetlands. List four ways in which human activities are disrupting and degrading many of the ecosystem and economic services provided by freshwater rivers, lakes, and wetlands. How is Alexandra Cousteau attempting to educate people about the importance of aquatic systems?