For one/two-semester, junior/graduate-level courses in geochemistry. This text covers the entire field of geochemistry -- assuming very little chemical and mathematical background on the part of students. It uses a blend of theory, laboratory, and field studies to show how geochemical principles can be used to solve specific geologic problems, and features many detailed examples of the application of geochemical principles to the study of natural waters, soil, and sedimentary, igneous, and metamorphic rocks.