The Piedmont Lowland parallels the Piedmont Upland to its northwest. It really is crafted from sedimentary rocks into which volcanic rocks are already intruded. Some volcanic rocks make ridges. The Fight of Gettysburg was fought there, the Northern army about the superior ridges acquiring the advantage above the Southern forces https://pa86421.digiblogbox.com/45232179/how-much-you-need-to-expect-you-ll-pay-for-a-good-pa