Kindergarten-Grade 2–Each of these introductions explains the relevant state of matter, along with basic vocabulary. The layout is bright with many color photographs featuring children of different ethnicities. The text is spare; each spread includes, on average, three sentences. In Gas, the fact that gases take the form of their container is accompanied by photographs of a balloon slowly filling. The book concludes with a simple explanation and graphic of the oxygen cycle. Liquid states that this form of matter also takes the shape of its vessel and can be changed into other states. In Solid, the text concludes with a simple experiment using a tea bag, drink mix, and glass of water to show how solids can dissolve in a liquid. There is some crossover of coverage among the books.
