<Tr> <Th> Type of rock </Th> <Td> granite, gneiss and limestone </Td> </Tr> <P> The Blue Ridge Mountains are a physiographic province of the larger Appalachian Mountains range . This province consists of northern and southern physiographic regions, which divide near the Roanoke River gap . The mountain range is located in the eastern United States, starting at its southernmost portion in Georgia, then ending northward in Pennsylvania . To the west of the Blue Ridge, between it and the bulk of the Appalachians, lies the Great Appalachian Valley, bordered on the west by the Ridge and Valley province of the Appalachian range . </P> <P> The Blue Ridge Mountains are noted for having a bluish color when seen from a distance . Trees put the "blue" in Blue Ridge, from the isoprene released into the atmosphere, thereby contributing to the characteristic haze on the mountains and their distinctive color . </P> <P> Within the Blue Ridge province are two major national parks: the Shenandoah National Park, in the northern section, and the Great Smoky Mountains National Park, in the southern section . The Blue Ridge also contains the Blue Ridge Parkway, a 469 - mile (755 km) long scenic highway that connects the two parks and is located along the ridge crestlines with the Appalachian Trail . </P>

Where did the blue ridge mountains get their name
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