Carol Hill is the author of scientific articles on the GrandGregg Davidson is the Chair of Geology & Geological EngineerWayne Ranney is a former park ranger, geologic speaker and tTim Helble is a hydrologist with the National Weather Servic Canyon published in Science, Geology, Geosphere, and other ing at the University of Mississippi. He has written a numbeour guide, and author of several books, including Carving Gre, working seasonally in the Grand Canyon. journals, as well as Christian apologetics articles for Persr of articles and the book When Faith and Science Collide. D
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