University of Minnesota, Morris

As a discipline, geology is classically defined as the study of the Earth. Over the years, however, the geosciences have evolved to encompass a broad range of subdisciplines, each focusing on a specific group of Earth processes.

In practice, geologists also draw heavily on the allied sciences of chemistry, physics, mathematics, and biology. Thus, geology is an interdisciplinary science, and in some cases to such a degree that there exist, for example, the subdisciplines of geochemistry, biogeochemistry, and geophysics.