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University of Texas at Austin
University of Texas at Austin: Metamorphic Rocks Lab
A lab with good info on metamorphic rock definitions, factors, grades, types, and composition. These are lecture notes and overheads from a geology class, and useful for review.
Soft Schools
Soft Schools: Geology Quizzes: Rock Types
Assess your understanding of the three major categories of rocks with this interactive multiple choice quiz. Immediate feedback is provided.