In this installment, Dr. Chris meets up with Wisconsin hydrogeologists, both out in the field and in the laboratory, to learn who they are and how they investigate groundwater. Find out about the Wisconsin Geological and Natural History Survey and its latest efforts to understand the complexity of Wisconsin’s water resources and the role that naturally occurring contaminants play in water systems beneath the ground as you hear the sounds made when drilling cores in old quarries and bombarding samples with X-rays. You’ll discover why geologists love what they do, and that, yes, there is indeed a Library of Rock.