(n) :
one of a number of parallel grooves and ridges in a rock, formed by repeated twinning of crystals; one of a number of parallel scratch lines in rock outcrops, formed when glaciers dragged rocks across the landscape
(n) :
one of a number of parallel grooves and ridges in a rock, formed by repeated twinning of crystals; one of a number of parallel scratch lines in rock outcrops, formed when glaciers dragged rocks across the landscape