On Solid Ground illustrates what geologists know about the earth by telling the stories of the people who made major geological discoveries. It also chronicles the doubters and nay-sayers who have worked so hard to undermine our understanding of the earth. Each chapter of this book contains three things: the human story of a geologic controversy, an explanation of why geologists are so sure about the right answer to that controversy, and a short discussion of the logical fallacies being used by those still unwilling to accept geologic expertise.