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This case study addresses the issue of freshwater resources in regions around Mono Lake and Owens Valley being diverted from natural communities and human settlements to meet the needs of a growing population in Los Angeles. Students are given a history of the issue, topics to debate, map and satellite images, and lesson plans. Activities include: mapping water distribution; demonstrating osmosis; and testing for levels of phosphate, chloride, sulfate, carbonate, and pH in environmental waters.