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.
Columbiaville is a village in Lapeer County in the U.S. state of Michigan. The population was 815 at the 2000 census. The village is within Marathon Township on the Flint River. The first settler on the site of the village was Levi D. Cutting, a carpenter and cabinet maker by trade, who arrived with his family in 1847. His home in Columbiaville is still standing at the south corner of Water and Lapeer Streets. In 1848, George and Henry Niver built a saw mill on the banks of the Flint River and the place became known as Niverville.