Geophysics Study: The geographical equation, Volume 5, provides an overview of the most important aspects of terrestrial magnetism. The book begins by tracing the history of the study of terrestrial magnetism.

It then reviews global models of the Earth's magnetic field. The main sources of external magnetic field contributions; and the tools and practices used to monitor and measure the full range of terrestrial magnetic field features.

Discusses the origin of current knowledge of the secular diversity of the Earth's magnetic field. Magnetism; magnetic flight; study of electromagnetic geophysical induction; magnetization and state of modern magnetic field data and applications.

The remaining chapters cover geomagnetic field geometry and its temporal change as recorded in volcanic and sedimentary rocks over a few million years ago; the ocean crust as a record of terrestrial magnetic field changes; and the theoretical basis of the paleointensity experiment in the fiery and sedimentary environments. The last chapter explains the concept of True Polar Navigation (TPW), defined as changes in the geographic location of the daily earth's rotation and / or fluctuations in the rotation rate (day-length abnormalities)..