the earth beneath the sea history ocean bottom marine geophysics ay az ax aa 43 42 41 2700 n ah aj ak ai al am an k v ao ap ag at au ar as h azi i 40 39 38 45 fig 22 forty eight profiles across the northwest atlantic mid ocean canyon after heezen et al 1959 is associated with an abyssal gap through a ridge dividing the northwest arm of the sohm plain from the rest in the indian ocean soundings taken by the swedish deep sea expedition in the albatross have shown the existence of trough shaped features in an otherwise flat and featureless fl re94cm.jpg from অপুhdamy ocean dream View Photo