Name Class Date What causes water pollution? Lesson Review Complete the following. 1. What causes water pollution? ________________________________________________________________ 2. What is sewage? ____________________________________________________________________________ 3. What harmful things are contained in sewage? _________________________________________________ 4. What is a fertilizer? _________________________________________________________________________ 5. What is a pesticide? _________________________________________________________________________ 6. What kinds of water pollutants are produced by industry? ______________________________________ 7. What is a sewage treatment plant? ____________________________________________________________ ___________________________________________________________________________________________ 8. How have laws helped to reduce water pollution? _____________________________________________ ___________________________________________________________________________________________ ___________________________________________________________________________________________ Skill Challenge Skills: diagramming, sequencing In the space below, develop a flowchart that shows two pathways that sewage may take before it enters the environment. One pathway should show untreated sewage entering the environment. The other pathway should show treated sewage entering the environment. Identify the source of the sewage and each step in your flowchart. Concepts and Challenges in Earth Science, Teacher’s Resources CD-ROM (c) by Pearson Education, Inc./Globe Fearon/Pearson Learning Group. All rights reserved. The Human Impact on the Environment Answer Key What causes water pollution? Lesson Review 1. release of harmful substances into the water 2. wastes that are usually flushed away in water 3. bacteria, chemicals, and soaps 4. chemicals that help plants grow 5. chemical that is used to kill insect pests 6. chemical pollutants 7. place in which sewage is changed into less harmful materials 8. The laws require industries to clean their wastes before dumping them into lakes and rivers and ban the use of certain pesticides and soaps. Skill Challenge Check students’ drawings to be sure that one pathway shows sewage from a plant or building being dumped directly into lakes or streams and the other pathway shows sewage passing through a sewage treatment plant. Concepts and Challenges in Earth Science, Teacher’s Resources CD-ROM (c) by Pearson Education, Inc./Globe Fearon/Pearson Learning Group. All rights reserved. The Human Impact on the Environment