Encyclopediabentonitebentonite (ben'tunīt") [key]: see clay. The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved. More on bentonite from Fact Monster:
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- Rapid City - Rapid City Rapid City, city (1990 pop. 54,523), seat of Pennington co., SW S.Dak., on Rapid Creek, ...
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