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Introduces the two types of weathering that cause the natural process of erosion--mechanical and chemical--and describes the effects of erosion, how unnatural forms of erosion can be prevented, and related topicsTitle: ErosionAuthor: Zappa, MarciaPublisher: Abdo GroupPublication Date: 2010/09/01Number of Pages: 32Binding Type: LIBRARYLibrary of Congress: 2009053194