Abstract
Courses in physical geology provide a logical and systematic presentation of earth materials and the processes that relate to them. Rock-cycle diagrams graphically illustrate the interrelationship between materials (products) and processes. A clear diagram and frequent discussion of the rock cycle are essential. The discussion should clearly differentiate products from processes. It is also useful to review the rock cycle during discussion of other applicable topics, for example, plate tectonics and volcanism. Nine contemporary physical geology textbooks were reviewed with these criteria in mind. Although seven of the nine textbooks reviewed did discuss the rock cycle, two of the nation's leading sellers did not mention it.
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