Geomagnetism, the oldest Earth science, studies the Earth's magnetic field in its broadest sense. Paleomagnetism is the study of magnetic record left in rocks. Both sciences have applications in navigation, in the search for minerals and hydrocarbons, in dating rock sequences, and in unraveling past geologic movements such as plate motions they have contributed to a better understanding of the Earth. Consisting of more than 300 articles written by leading experts, this authoritative reference encompasses the fields of Geomagnetism and Paleomagnetism in a single volume. It describes in fine detail the current state of knowledge and provides an up-to-date synthesis of the most basic concepts. It is an indispensable working tool not only for geophysicists and geophysics students but also for geologists, physicists, atmospheric and environmental scientists, and engineers.