Geology--another subject I'm not cut out for. Maybe it would have been different if the class had been taught differently, but this book was essentially useless. To be fair: it's full of pictures and diagrams, which I suppose is helpful if you're an intensely visual learner with a strong interest in the subject. However, many of the pictures are so intricate that you don't know what to look at first. Many of the pages have a box that reads: "before leaving this page you should be able to..." Well, I usually was not able to [whatever]. I was successful in my class overall, but not because of the book. Seriously...I hate this book.