Modern Marvels: Rocks: They’re in every skyscraper we erect and every road we pave. The indispensable ingredients of the mundane and the monumental. Some can even float while others can supply us with unlimited... (more details for Modern Marvels: Rocks)

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File by Michael Meeks (#225)
2008-08-24 Grade: 9-10
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2010-11-12 Grade: 6-8