This is a course in the fundamental principles of rock magnetism, paleomagnetism, and geomagnetism and its applications to geology and geophysics. Topics will include the origin and behavior of the geomagnetic field, physical and chemical basis of paleomagnetism; physics of magnetism as it applies to rocks and minerals; origin of remanent magnetization; mineralogy of magnetic minerals; paleomagnetic measurement techniques; magnetostratigraphy; geodynamics, environmental magnetism; and biogeomagnetism. The course is suitable for undergraduate juniors and seniors and graduate students in physics, geophysics, geochemistry, mineralogy-petrology, and quaternary studies who want a basic understanding of paleomagnetism and its potential applications to the Earth Sciences.