The Piedmont Lowland parallels the Piedmont Upland to its northwest. It is product of sedimentary rocks into which volcanic rocks are intruded. A few of these volcanic rocks make ridges. The Fight of Gettysburg was fought there, the Northern Military over the large ridges getting the benefit about the Southern https://griffinbglpt.newsbloger.com/24917057/closet-organization-macungie-can-be-fun-for-anyone