Lebanon County is a county located in the U.S. state of Pennsylvania. As of the 2010 census, the population was 133,568. Its county seat is Lebanon. The county was formed from portions of Dauphin and Lancaster counties in 1813, with minor boundary revisions in 1814 and 1821. Lebanon County comprises the Lebanon, PA Metropolitan Statistical Area, which is also included in the Harrisburg-York-Lebanon, PA Combined Statistical Area.
sedimentary rocks change with heat and pressure and become metamorphic rock then rocks melt into magma.
If the magma cools within the Earth it forms large bodies of crystalline rock called plutons or batholiths. These rocks are called intrusive igneous rocks. Sedimentary rocks are formed in layers deposited by wind, water or ice. The are the product of the process of weathering. As sedimentary layers are buried they are cemented and lithified. Metamorphic rocks are rocks formed by the action of pressure, temperature and fluids within the Earth. As sediments are deeply buried they are deformed and new minerals recrystallize at the elevated temperatures and pressures to form metamorphic rocks.