Plate Tectonics is a theory developed in the late 1960s, to explain how the outer layers of the Earth move and deform. The theory has caused a revolution in the way we think about the Earth. Since the development of the theory, geologists have had to reexamine almost every aspect of Geology. Plate tectonics has proven to be so useful that it can predict geologic events and explain almost all aspects of what we see on the Earth.
Steubenville is a city in and the county seat of Jefferson County, Ohio, United States. Located along the Ohio River, it had a population of 18,659 at the 2010 census.
On March 1, 1803, Ohio was admitted to the Union as the 17th state. During the first half of the nineteenth century, Steubenville was primarily a port town, and the rest of the county was small villages and farms. Steubenville received a city charter in 1851.