Title Work Title No: 24153 Medium: Moving Image Date: 1985 (Release) Original Summary: "Explains how scientists have learned about the ice ages from moraines, erratics, and bedrock left by moving ice. Points out that scientists hope to find out if the glaciers will return by studying the ice sheets and glaciers of the present time" - Summary from Worldcat. Countries of Origin: U.S.A. Genres: Educational
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