Show mountains and vales in depths of ocean soundings have now been taken of the worlds deepest waters to a depth of feet and raised or relief maps of the sea bottom are arc available in crossing I 1 the ocean ono one sails baila over mountain chains valleys and plateaus says bays tile the london express in setting sail across tho the atlantic from the shores of the united states ono one first passes over tho the continental slopes which extend far out liko like a great shelf beyond t this is a vast plain of remarkably mar kably uniform depth it is flat and featureless interrupted only by an occasional rock this plain continues on oil with scarcely a break half way across the atlantic A great ridge of mountains Is is crossed which extends south from iceland mid and practically divides the ocean in two tivo it is almost exactly parallel with tho the eastern shores or contour of europe an and africa in several places this ridge rises above tile level of the ocean as tit at the azores it i is s estimated that if a all 11 the alio mountains on the earth were vere leveled on and used to fill in the valleys the earth would bo be covered by a vast plateau cau while tho oceans would have an average depth of feet |