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.
Lesson: Igneous rocks are formed when the magma from a volcano cools-. Sedimentary rocks form when eroded earth and other materials settle in layers. These layers press down over time to form solid rock. Metamorphic rocks are igneous or sedimentary rocks that have been changed by high temperatures or extreme pressure.