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.
Ridgeville, Ohio. Ridgeville is an unincorporated community in central Clearcreek Township, Warren County, Ohio, United States. It is located on State Route 48 in the north central part of the county, in sections 30 and 36, T4R4, Between the Miami Rivers Survey. Ridgeville was platted in 1814 by Fergus McLean, the father John McLean, afterward a United States Supreme Court Justice. A post office called Ridgeville was established in 1815, and remained in operation until 1908. 1  The History of Warren County, Ohio: Containing a History of the County ; Its Townships, Towns ; General and Local Statistics.  2 Warren County.