Cengage Advantage Books: Sustaining the Earth 10th Edition by Tyler Miller,Scott Spoolman

تمرين 27

Explain how streams can cleanse themselves and how these cleansing processes can be overwhelmed. What is an oxygen sag curve, and what causes it? Describe the state of stream pollution in less-developed and in more-developed countries. Give two reasons why lakes cannot cleanse themselves as readily as streams. Distinguish between eutrophication and cultural eutrophication. List three ways to prevent or reduce cultural eutrophication. Summarize the story of pollution in the Great Lakes and efforts to reduce this pollution.