continental dived the line of summits of the rocky mountains, separating streams flowing toward the gulf of califonia and the pacific from those flowing toward the gulf of mexico
glacier an extended mass of ice formed from snow falling and accumulating over the years and moving very slowly, either descending from high mountains, as in valley glaciers, or moving outward from centers of accumulation, as in continental glaciers.
mesa a land formation, less extensive than a plateau, having steep walls and a relatively flat top and common in arid and semiarid parts of the southwestern U.S. and Mexico.