 Water Pollution - Chapter 21 (pgs 338-355)
 Vocabulary: define the following words
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1. Sewage
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2. Sewage-treatment plant
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3. Pathogen
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4. Toxic chemical
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5. Heavy metal
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6. Eutrophication
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7. Thermal pollution
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Section 21.1 Water Pollution Problem
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Objectives:
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Explain the link between water pollution and human disease.
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Identify the major types of water pollutants and their sources.
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Think Critically
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Medical waste on NY and NJ beaches, warnings not to eat shellfish in Delaware because
of bacteria in the water, an oil slicks near Texas and Alaska discolor beaches and damage
ecosystems.
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What is the major cause of these problems?
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How can these problems be stopped?
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Water Pollution Problem
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For many ______________________________________________________________________
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As ____________________________________________________________________________
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In 1885 ________________________________________________________________________
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German _______________________________________________________________________
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People ________________________________________________________________________
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But ___________________________________________________________________________
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Sewage – ______________________________________________________________________
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Comes ________________________________________________________________________
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The U.S________________________________________________________________________
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Most of ________________________________________________________________________
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Also, __________________________________________________________________________
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Sewage Treatment Plant – ________________________________________________________
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Sewage _______________________________________________________________________
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Further _______________________________________________________________________
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Bacteria – _______________________________________________________________
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Chemicals _______________________________________________________________
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These _________________________________________________________________________
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This organic ____________________________________________________________________
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Pathogens – ___________________________________________________________________
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Many _________________________________________________________________________
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Pathogens _____________________________________________________________________
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With __________________________________________________________________________
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In developing countries – _________________________________________________________
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Schistosomiasis
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Disease ________________________________________________________________________
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The ___________________________________________________________________________
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Affects ________________________________________________________________________
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Malaria
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Disease ________________________________________________________________________
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Transmitted ____________________________________________________________________
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Water _________________________________________________________________________
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Worldwide _____________________________________________________________________
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Common ______________________________________________________________________
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Check For Understanding
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1. What is sewage?
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2. Create a flowchart that details the relationship between sewage, contaminated water,
pathogens, and humans
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Section 21.2 Chemical Pollutants
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Objectives:
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Examine the sources and effects of inorganic and organic toxic chemicals
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Describe the process of eutrophication and its effects on lake ecosystems
Think Critically
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Did you ever read the book “Alice’s Adventures in Wonderland”?
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There was a character called the Mad Hatter.
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Can you guess why he was called Mad?
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Toxic chemicals – _______________________________________________________________
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Inorganic chemicals – ____________________________________________________________
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Organic chemicals – _____________________________________________________________
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Include ________________________________________________________________________
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Heavy metals – _________________________________________________________________
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Plant nutrients – ________________________________________________________________
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Enter _________________________________________________________________________
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Minamata, Japan
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Animals began __________________________________________________________________
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Townspeople ___________________________________________________________________
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The ___________________________________________________________________________
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A _____________________________________________________________________________
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This ___________________________________________________________________________
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Over 20 years, __________________________________________________________________
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Organic Chemicals
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Chemicals ______________________________________________________________________
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Gasoline, ______________________________________________________________________
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Enter water as:
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Wastes _________________________________________________________________
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Exxon Valdez
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1989- _________________________________________________________________________
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42,000 ________________________________________________________________________
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Ecosystem _____________________________________________________________________
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Eutrophication
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Fertilizers ______________________________________________________________________
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They enter _____________________________________________________________________
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When _________________________________________________________________________
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Bacteria _______________________________________________________________________
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More _________________________________________________________________________
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Issues – Lake Erie: A Success Story
-Read page 346 in your textbook
-Answer Decision questions on a sheet of paper and hand in before class is over.
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Check For Understanding
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1. What is eutrophication?
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2. Describe the difference between an organic and inorganic chemical. Give one example of
water pollution by each.
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3. The Exxon Valdez oil spill occurred because of human error. Can the possibility of human error
ever be eliminated?
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Section 21.3 Radioactivity and Thermal Pollution
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Objectives:
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Explain the problems of radioactive and thermal water pollution
Think Critically
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Nuclear power plants can produce energy that does not pollute the air.
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But, they also produce a lot of radioactive wastes that are hard to get rid of.
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Do you think we should rely on nuclear energy?
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Radioactivity
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Radioactive ____________________________________________________________________
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Radioactivity ___________________________________________________________________
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Whether a _____________________________________________________________________
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In 1973, _______________________________________________________________________
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The ___________________________________________________________________________
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2,100 _________________________________________________________________________
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Thermal Pollution
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A large ________________________________________________________________________
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Usually ________________________________________________________________________
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Affects ecosystems in several ways:
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Check For Understanding
1. What is thermal pollution?
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2. Nuclear power plants produce large amounts of radioactive water? Why?
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Section 21.4 Controlling Water Pollution
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Objectives:
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Identify government attempts to control water pollution.
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Describe the problems involved in enforcing laws regarding water pollution.
Think Critically
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Water pollution is found almost everywhere.
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Laws have been made to control this pollution.
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Why might these be hard to enforce?
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Laws
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Beginning in 1898, _______________________________________________________________
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But, ___________________________________________________________________________
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Individual _______________________________________________________________
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Scientific ________________________________________________________________
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Several _________________________________________________________________
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Little was ________________________________________________________________
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The ____________________________________________________________________
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In response ____________________________________________________________________
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Check For Understanding
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1. What is being done to control water pollution? Are these measures effective?
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2. What can you do as an individual to reduce the effects of water pollution?
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3. You are on the town planning community. A company that employs 75% of the people in your
community has been cited for water pollution violations. The company says it will move if it is
told to pay the fines. Will you vote to make the company pay?
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