Uniformitatrianism is the concept that the processes that have shaped the earth in the geologic past are essentially the same as those operating today. It is now the accepted theory of the present-day processes and results occuring on our planet. However, Sir Charles Lyell is given most credit for basic principles of modern geology. The eruption of a volcano, the terror of an earthquake, the majestic mountains, and shifting of plate tectonics are all subjects studied in physical geology. The study of physical geology deals with many practical questions about our physical environment.
Physcial geology examines the materials that compose our planet and the processes that modify it.
Understanding the earth processes that create mineral resources and produce geologic hazards is necessary for human society. Geologists are needed and employment opportunity exists. New York, 1993.