The following books and websites contain additional information, activities, and enrichment options.

Solid, Liquid or Gas?

Sally Hewitt, Children's Press, 1998

Solids, Liquids, Gases

Charnan Simon, Compass Point Books, 2000

What Is the World Made Of? All About Solids, Liquids, and Gases

Kathleen Weidner Zoehfeld, HarperTrophy, 1998

See the Best of the Net feature at www.eduplace.com/science and sites recommended by the National Science Teachers Association at www2.nsta.org/sciencesites/