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Tell Me Why

IV: Gems, Metals & Minerals

Answers questions such as "What is erosion?" "How many different kinds of rocks are there?" "What is coal?" "What is an alloy?" (Also Available in Spanish)

Each video comes complete with its own printed Study Guide containing a glossary, additional questions and suggested learning strategies.
Running time: 30 min.

K623
$19.95
Spanish
K6235
K623DVD
$29.95

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