Geochemistry is the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earths crust and its oceans‎.‎ The realm of geochemistry extends beyond the Earth‎,‎ encompassing the entire Solar System and has made important contributions to the understanding of a number of processes including mantle convection‎,‎ the formation of planets and the origins of granite and basalt‎.‎ Geochemistry for undergraduate/graduate students with at least an elementary‎-level background in earth sciences‎,‎ chemistry‎,‎ and mathematics‎.‎ In keeping with the modern trend in the field of geochemistry‎,‎ the book emphasizes computational techniques by developing appropriate mathematical relations‎,‎ solving a variety of problems to illustrate application of the mathematical relations‎,‎ and leaving a set of questions at the end of each chapter to be solved by students‎.‎