SCIENCE
(4) 4-6 Checkerboard Science Library: Earth's Treasures series. This series tracks the history, natural origins, and modern uses of valuable elements and minerals. In addition to their cultural and geological backgrounds, Petersen discusses where they can be found today; sidebars suggest ways for readers to find or interact with them. Maps, diagrams, rather dull photos, and garish gem-stone borders don't add much to the clear and informative texts. Glos., ind. Review covers these Earth's Treasures titles: Diamonds, Gold, Jade, and Pearls.

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