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K-3MathStart series.
Illustrated by
Cat Bowman Smith.
When Amy and Josh begin a rock collection, their friend Dave shows them ways to organize their rocks: by size, place of origin, color, the process that formed them, or hardness. Although the unsuspecting will think they are learning only about rocks, the topic of classification is thoroughly explored and is extended with activities for adults and children at the end of the story. Loose color cartoons keep the tone light.