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DOUBLE TAP TO ZOOM WITH PHONE OR TABLET More Play Adventures Build dams. Foil, clay, mud, and other materi- als can be used to dam and change the course of a foil river. Add color. Use liquid watercolor or food color- ing to add color to your foil river. Construct a lake. Challenge children to use foil to build a lake for their river to flow into. Try tributaries. See if kids can make two, three, or more small rivers flow into a big river. Fabricate waterfalls. Can the kids figure out how to add a waterfall or two to their foil river? 12 Chapter 2 COPYRIGHTED MATERIAL