Now in a thoroughly updated new edition (the first since 1995), Petrology remains . . . [a] student-friendly undergraduate level text covering all three major rock groups. As always, the new edition organizes a vast body of literature from its wide-ranging subject, presenting what is essential to geology majors in a way that is accessible and at an appropriate level. The new edition welcomes Brent Owens as the new lead author for the chapters on igneous rocks, complementing Harvey Blatt's role for the sedimentary chapters, and Robert Tracy's for the metamorphic chapters.