Krauskopf and Bird's third edition of Introduction to Geochemistry should remain a standard for introductory textbooks in this field into the 21st century. Anyone teaching an introductory course in geochemistry must consider using this text in class. I have used the book in my classes for the last 27 years; it always serves as the backbone of my courses, though I supplement its view of geochemistry with my own for balance. The third edition, like the earlier editions, is meant to introduce geochemistry to undergraduate students who have taken basic courses in Earth sciences, chemistry, and mathematics. It can also be used at the graduate level for Earth, ocean, and environmental science students with weak academic backgrounds in general geochemistry.