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1989. GEMS. Based on teacher feedback, and on a collaborative effort between GEMS and Project 2061 of the American Association for the Advancement of Science (AAAS), this newly revised River Cutters has been expressly designed to meet major benchmarks and more strongly align with the National Science Education Standards. A new session focuses on improving student comprehension of geologic time. Students create river models using a new and improved dripper system and diatomaceous earth. They acquire geological terminology and begin to understand rivers as dynamic, ever-changing systems. The concepts of erosion, pollution, toxic waste, and human manipulation of rivers are explored. 120 pages, soft cover, b&w photos and illustrations. Seven sessions, grades 6-9.