Directed Reading B. Section: Environmental Problems POLLUTION

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1 Skills Worksheet Directed Reading B Section: Environmental Problems POLLUTION 1. Which of the following is an unwanted change in the environment caused by substances or forms of energy? a. overpopulation b. biodiversity c. pollution d. evolution Garbage 2. Who throws away the most trash? a. animals b. average person in the United States c. average person outside the United States d. exotic species 3. What kind of wastes can catch fire, explode, or make people sick? a. harmful wastes b. dangerous wastes c. hazardous wastes d. critical wastes Chemicals 4. What might some chemicals do to the environment? a. They might harm the environment. b. They might recycle the environment. c. They might burn the environment. d. They might renew the environment. Holt Science and Technology 9 Environmental Problems and Solutions

2 5. What are two harmful chemicals that are now banned? a. ozone and fertilizers b. PCBs and ozone c. fertilizers and CFCs d. CFCs and PCBs 6. Which of the following types of chemicals destroy the ozone that protects people from harmful ultraviolet light? a. pesticides b. CFCs c. PCBs d. fertilizers High-Powered Wastes 7. What dangerous wastes are produced by nuclear power plants? a. chemical wastes b. radioactive wastes c. poisonous gas d. harmful paints Gases 8. Which of the following air pollutants has increased since the Industrial Revolution? a. oxygen b. carbon dioxide c. hydrogen d. ultraviolet light Holt Science and Technology 10 Environmental Problems and Solutions

3 9. What do some scientists think more carbon dioxide in the atmosphere has caused? a. more rain b. more clouds c. higher global temperatures d. longer winters 10. If higher global temperatures melted the polar icecaps what could happen? a. coastal floods b. colder air c. less rain d. more rain Noise 11. Which of the following does noise pollution damage? a. the atmosphere b. your hearing c. the ocean d. the land RESOURCE DEPLETION Read the description. Then, draw a line from the dot next to each description to the matching words. 12. a resource that can be replaced at the same rate at which it is used 13. a resource that cannot last forever a. nonrenewable resource b. renewable resource Holt Science and Technology 11 Environmental Problems and Solutions

4 Renewable or Nonrenewable? 14. What might happen if fresh water is used faster than it can be replaced? a. Plants and animals will survive without water. b. People might drink less water. c. Fresh water might run out. d. Nothing will happen to the water. EXOTIC SPECIES 15. What are organisms that make homes in new places called? a. strange species b. exotic species c. endangered species d. new species 16. Why do some exotic animal species harm new habitats? a. They don t have predators. b. They don t have prey. c. They can t build nests. d. They can t find food. HUMAN POPULATION GROWTH 17. What kind of advances have helped the human population grow? a. advances in computers and television b. advances in housing and clothing c. advances in medicine and farming d. advances in education and entertainment Holt Science and Technology 12 Environmental Problems and Solutions

5 18. The presence of too many individuals in an area for the available resources is called what? a. crowding b. overpopulation c. migration d. concentration HABITAT DESTRUCTION 19. What is the number and variety of organisms living together in an area called? a. families b. species c. biodiversity d. kingdoms Read the words in the box. Read the sentences. Fill in each blank with the word or phrase that best completes the sentence. biodiversity habitat 20. The place where an organism lives is called a(n). 21. When a habitat is damaged or destroyed, is lost. Holt Science and Technology 13 Environmental Problems and Solutions

6 Forest Habitats 22. What is deforestation? a. the planting of forests b. the animals in the forest c. the clearing of forest lands d. the trees in the forest Marine Habitats 23. What is pollution that comes from only one source called? a. point-source pollution b. nonpoint-source pollution c. harmful pollution d. one-source pollution 24. What is pollution that comes from many different sources called? a. point-source pollution b. nonpoint-source pollution c. harmful pollution d. many-source pollution 25. When harmful chemicals are dumped into marine habitats, what might happen? a. The chemicals might kill or harm marine organisms. b. The chemicals might dry up the water. c. The chemicals might cause flooding. d. The chemicals might cause deforestation. Holt Science and Technology 14 Environmental Problems and Solutions

7 EFFECTS ON HUMANS 26. When something in the environment harms other organisms, what may also be harmed? a. travel b. communication c. rocks d. people 27. What disease might chemicals cause years after someone is exposed to them? a. chicken pox b. cancer c. measles d. colds Holt Science and Technology 15 Environmental Problems and Solutions