How do oceanic ridges differ from continental mountain ranges? View Available Hint(s) How do oceanic ridges differ from continental mountain ranges? Most mountain ranges form through the collision of two basaltic plates, whereas oceanic ridges form when material upwells from the mantle between two felsic plates. The heights of continental mountains are derived from hot spots under the mantle, and the heights of oceanic ridges are derived from the crumpling of oceanic crust. Most mountain ranges form when material upwells from the mantle between two continents, whereas oceanic ridges form from the collision of two oceanic plates. Mountain ranges consist mainly of basaltic rock, whereas oceanic ridges consist mainly of felsic rock. Most mountain ranges form through the collision of two continents, whereas oceanic ridges form when material upwells from the mantle and generates new oceanic crust.