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.
1 Click here for deed transfers recorded within Jefferson Township of Greene County, Pennsylvania.  Jefferson Morgan Regional Council of Governments (JMRCOG): was created in 2004 and includes Jefferson Township, Morgan Township, Clarksville Borough, Jefferson Borough and Rices Landing Borough.