[PAR] [TLE] Appalachian Mountains [SEP] The Appalachian Mountains ( , French: "les Appalaches" ), often called the Appalachians, are a system of mountains in eastern North America.  The Appalachians first formed roughly 480 million years ago during the Ordovician Period.  It once reached elevations similar to those of the Alps and the Rocky Mountains before naturally occurring erosion.  The Appalachian chain is a barrier to east-west travel, as it forms a series of alternating ridgelines and valleys oriented in opposition to most roads running east or west. [PAR] [TLE] Trenton Prong [SEP] The Trenton Prong is a physiographic subprovince of the Piedmont Uplands section of the Piedmont province of the Appalachian Mountains.  The prong consists of crystalline metamorphic rock.
[PAR] [TLE] Appalachian Mountains [ SEP ] The Appalachian Mountains ( , French : " les Appalaches " ) , often called the Appalachians , are a system of mountains in eastern North America . The Appalachians first formed roughly 480 million years ago during the Ordovician Period . It once reached elevations similar to those of the Alps and the Rocky Mountains before naturally occurring erosion . The Appalachian chain is a barrier to east - west travel , as it forms a series of alternating ridgelines and valleys oriented in opposition to most roads running east or west . [PAR] [TLE] Trenton Prong [ SEP ] The Trenton Prong is a physiographic subprovince of the Piedmont Uplands section of the Piedmont province of the Appalachian Mountains . The prong consists of crystalline metamorphic rock .
The Trenton Prong is a section of the Piedmont province of what that was formed roughly 480 million years ago?
The Trenton Prong is a section of the Piedmont province of what that was formed roughly 480 million years ago ?
The Appalachian Mountains
The Appalachian Mountains