Water Pollution
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C HAPTER
Chapter 1. Water Pollution
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Water Pollution
Lesson 21.2: True or False Name___________________ Class______________ Date________ Write true if the statement is true or false if the statement is false. _____ 1. Point source pollution is harder to control. _____ 2. Agricultural pollution can contaminate well water. _____ 3. Livestock waste is always stored safely in lagoons. _____ 4. Industrial water pollution commonly includes toxic chemicals such as mercury. _____ 5. No harm is done if lawn chemicals are washed into storm sewers. _____ 6. Most of the pollution in the oceans is carried there by rivers and runoff. _____ 7. Oil leaks and spills occur only in the oceans. _____ 8. Thermal pollution kills fish by making the water too cold. _____ 9. In some places, people dump trash and raw sewage into the ocean. _____ 10. If polluted water infiltrates the ground, it is no longer a problem.
Lesson 21.2: Critical Reading Name___________________ Class______________ Date________ Read this passage based on the text and answer the questions that follow. Ocean Water Pollution The oceans are vast. You might think that they are too big to be harmed by pollution. But that’s not the case. Ocean water is becoming seriously polluted. The oceans are most polluted along coasts because most pollution enters the oceans from the land. Runoff and rivers carry the majority of pollution into the oceans. Many cities dump their wastewater into coastal waters. The wastewater may not be adequately treated to make it safe. In some parts of the world, raw sewage and trash may be thrown directly into the water. Coastal water may become so polluted that people get sick if they swim in it or eat seafood from it. The polluted water may also kill fish and other ocean life. Oil spills are another source of ocean water pollution. To get at oil buried beneath the seafloor, oil rigs are built to float on the water and drill into the ocean floor. Oil is pumped to the surface and transported to a refinery. Huge ocean tankers carry oil all over world. If something goes wrong with a rig or a tanker, millions of barrels of oil may end up in the water. The oil may coat and kill ocean animals. Oil also washes ashore. This oil may destroy coastal wetlands and ruin beaches. Questions 1. Where are oceans most polluted? Why? 2. Describe sources of ocean water pollution. 3. Identify causes and consequences of oil spills in ocean water. 1
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Lesson 21.2: Multiple Choice Name___________________ Class______________ Date________ Circle the letter of the correct choice. 1. Sources of water pollution include a. b. c. d.
industry. agriculture. municipal sources. all of the above
2. Examples of non-point source pollution include a. b. c. d.
a factory discharging chemicals into a lake through a pipe. runoff carrying pesticides into a lake from surrounding farmland. a nuclear power plant pumping warm water into a nearby lake. two of the above
3. If dissolved fertilizer enters bodies of water, it can lead to a. b. c. d.
too many fish. too many algae. dead zones. two of the above
4. Bacteria are most likely to contaminate water if it is polluted by a(n) a. b. c. d.
oil refinery. chemical plant. nuclear power plant. sewage treatment plant.
5. Nuclear power plants use water for a. b. c. d.
cooling. chemical reactions. nuclear fusion reactions. neutralizing radioactive elements.
6. Water pollution is a problem a. b. c. d.
only in poor nations. mainly in rich nations. all over the world. only for ocean animals.
Lesson 21.2: Matching Name___________________ Class______________ Date________ Match each definition with the correct term. Definitions _____ 1. major cause of water pollution 2
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Chapter 1. Water Pollution
_____ 2. pollution that enters water in many places _____ 3. pollution that raises the temperature of water _____ 4. where ocean pollution is worst _____ 5. pollution that enters water in just one place _____ 6. area in a body of water where nothing can live Terms a. non-point source pollution b. dead zone c. point source pollution d. agriculture e. coast f. thermal pollution
Lesson 21.2: Fill in the Blank Name___________________ Class______________ Date________ Fill in the blank with the appropriate term. 1. 2. 3. 4. 5. 6.
__________ carries agricultural chemicals from fields into bodies of water. The type of pollution in question 1 is called __________ source pollution. Water polluted with animal wastes causes human __________. Nuclear power plants may pollute water with __________ chemicals. Thermal pollution reduces the amount of __________ that water can hold. Most pollution enters oceans from the __________.
Lesson 21.2: Critical Writing Name___________________ Class______________ Date________ Thoroughly answer the question below. Use appropriate academic vocabulary and clear and complete sentences. Explain how agriculture can cause serious water pollution.
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