Types of Igneous Rocks. An igneous rock is formed by the cooling and crystallization of molten rock. The term igneous is derived from ignius, the Latin word for fire.Scientists have divided igneous rocks into two broad categories based on where the molten rock solidified.ypes of Igneous Rocks. An igneous rock is formed by the cooling and crystallization of molten rock. The term igneous is derived from ignius, the Latin word for fire.
Monongalia County, known locally as Mon County, is a county located in the U.S. state of West Virginia. As of the 2010 census, the population was 96,189, making it the fourth-most populous county in West Virginia. Its county seat is at Morgantown. The county was founded in 1776.
Morgantown is located 75 miles (121 km) south of Pittsburgh, Pennsylvania, 208 mi (335 km) north-northwest of Washington, D.C. , 204 mi (328 km) east of Columbus, Ohio, and 156 mi (251 km) northeast of Charleston, West Virginia. Morgantown is just south of the MasonâDixon line.