Natural or Man-Made?

Discusses the differences between natural and man-made substances using examples such as limestone, an ingredient in some toothpastes.Title: Natural or Man-Made?Author: Hicks, Kelli/ Lew, Kristi (EDT)Publisher: Rourke Pub GroupPublication Date: 2011/08/01Number of Pages: 24Binding Type: LIBRARYLibrary of Congress: 2011004843

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