What type of elevation does Allegheny Front and Appalachian Platea have in common?
Appalachian Plateau The Appalachian Plateau is a series of rugged, high plains located on the western side of the Appalachian Highlands. The Appalachian Highlands are a mountain range that run down the entire east coast of the United States.
External massif An external massif is, in the geology of the Alps, a place where crystalline rocks of the European plate crop out. Such massifs are found north and west of the Penninic zone (the crystalline "core" of the Alps) as tectonic windows in the Helvetic Zone. They differ from the crystalline nappes in that they were originally part of the European plate, while the Penninic nappes were part of the crust below various domains in the Tethys Ocean.