a mountain range is formed by rocks folding upon one another
mountain_range is group_of_mountains. mountain_range is land_topographical_feature. pyrenees is mountain_range. mountains has peak atlas_mountains is mountain_range. snow_capped_mountain is mountain. alpinism is mountain_climbing. mountain_range is high_mountainous_terrain. appalachian_mountains is mountain_range. climbing_mountains is good_excersize.