The Ocean Floors

The topography of the ocean floors is none too well known since in great areas the available soundings are hundreds or even thousands of miles apart. | However, the floor at the Atlantic is becoming fairly well known as a result of special surveys since 1920. | A broad, well-defined ridge-the Mid-Atlantic ridge- runs north and south between Africa and the two Americas. | Numerous other major irregularities diversify the Atlantic floor. | Closely spaced soundings show that many parts of the oceanic floors are as rugged as mountainous regions of the continents.