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.
Quick cooling lavas are called volcanic rocks. Magma that cools slowly creates rocks like granite, which have large minerals that can be seen with the naked eye. These igneous rocks cool inside the lithosphere, and are called plutonic rocks. Sedimentary rocks form at the Earthâs surface in two main ways.Clastic material (pieces of other rocks or fragments of skeletons) may become cemented together and chemical precipitation and evaporation can form sedimentary rocks.gneous rock, formed by the cooling of magma (molten rock) inside the Earth or on the surface. Sedimentary rocks, formed from the products of weathering by cementation or precipitation on the Earthâs surface.