This is Book 3 in the Cool Science S. Series. See all Cool Science S. books here.
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D. J. Ward is a high school science teacher who also writes science books for children. His titles include Exploring Mars, Materials Science, and, in the Let's-Read-and-Find-Out Science series, How a City Works and What Happens to Our Trash? He lives in Castle Rock, Colorado.
Violet Lemay has been an artist all her life. After enjoying a decade as a scenic
