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 and sites recommended by the National Science Teachers Association at