For introductory courses in physical geology. It's about how we know what we know. How Does Earth Work? covers the traditional breadth of topics of the introductory geology course, but takes the non-traditional and highly-effective approach of emphasizing conceptual learning of process rather than rote memorization of facts.
I was told that I needed to read this for my geology class, and to be honest it has to be one of the better science text books that I've ever had to read. This is very easy to follow, and if there are any questions that I would have had then they were easily answered with the CD that was included.