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.
Fredericktown is a city in and the county seat of Madison County, Missouri, United States, in the northeastern foothills of the Ozark Mountains. The population was 3,928 at the 2000 census. The city is surrounded on three sides (east, west, and south) by the easternmost parcel of the Mark Twain National Forest. The earliest European settlement in the area near what is now Fredericktown was Mine La Motte, a small community about six miles (10 km) to the north. Mine La Motte was first settled by Europeans to mine a large vein of galena lead ore distributed in dolomite that reached the surface there.