Stream Scanners Objective Students will investigate the quality of water in a stream, lake, or pond by examining chemical, physical, and biological characteristics. A stream with good quality water supports a variety of plants and animals.
Water polluted by chemicals or organic matter often supports only a few kinds of plants and animals.
If the pollution is severe, the stream water may kill all life around it. Action Distribute Stream Scanners funsheets and divide students into three groups. Assign one group to examine physical characteristics, one to record types of plant and animal life, and the third to conduct chemical tests. Assign groups one section of the stream or lake. Ask students doing tests to avoid disturbing stream banks or shallow waters.