very long lasting; less durable rocks were gradually worn away to form valleys; the perdurable granite of the ancient Appalachian spine of the continent
[ Syn: durable , indestructible , undestroyable ]
very long lasting; less durable rocks were gradually worn away to form valleys; the perdurable granite of the ancient Appalachian spine of the continent
[ Syn: durable , indestructible , undestroyable ]