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TITLE OF VIDEO: Finite Oceans VIDEO COMPREHENSION QUESTIONS: 1. How can studying eagles provide clues to understanding the health of the Great Lakes? 2. What are the major pathways by which pollutants enter the ocean? 3. What living organisms are being used to clean up wastewater? 4. How long will the pollutant DDT, which is partially responsible for the decomposition of the ozone layer, remain in the environment once it has been introduced? 5. What is the origin of fossil fuels? 6. What environmental characteristics of a desert can be used to generate pollution-free electricity? 7. What is the major advantage to using crop-based fuels instead of fuels made from crude oil? 8. What can be done to save the oceans from devastation? DiscoverySchool.com http://www.discoveryschool.com Copyright 2001 Discovery.com. Teachers may reproduce copies of these materials for classroom use only. See next page for answers. Finite Oceans VIDEO COMPREHENSION QUESTIONS AND ANSWERS: 1. How can studying eagles provide clues to understanding the health of the Great Lakes? By studying the health of the eagles, scientists learn how environmental conditions and pollution affect the lakes and their ecosystem. 2. What are the major pathways by which pollutants enter the ocean? Pollutants enter the ocean through toxins on land, in the air, and in other water sources. Accidental spills are also a source of ocean pollution. 3. What living organisms are being used to clean up wastewater? Marsh plants and bacteria can be used to recycle nutrients and detoxify wastewater. 4. How long will the pollutant DDT, which is partially responsible for the decomposition of the ozone layer, remain in the environment once it has been introduced? Essentially forever. DDT, which decomposes into a similar compound called DDE, survives indefinitely in the environment. 5. What is the origin of fossil fuels? Fossil fuels—including such products as coal, petroleum, and tar sands—are the remains of once-living organisms. 6. What environmental characteristics of a desert can be used to generate pollution-free electricity? Sun and wind provide sources of energy that can be transformed into electricity. 7. What is the major advantage to using crop-based fuels instead of fuels made from crude oil? Fuels that originate from crops biodegrade more rapidly than fuels made from crude oil. 8. What can be done to save the oceans from devastation? Boycotting polluters, supporting industries that work with the environment, electing the right leaders, taking legal action, and nonviolent protests can help preserve the oceans. DiscoverySchool.com http://www.discoveryschool.com Copyright 2001 Discovery.com. Teachers may reproduce copies of these materials for classroom use only.
