The text boxes in the left panel have been placed in a random order. Restore the original order by dragging the text boxes from the left panel to the right panel.
a) Closely spaced soundings show that many parts of the oceanic floors are as rugged as mountainous regions.
d) Numerous other major irregularities diversify the Atlantic floor.
c) However, the floor at the Atlantic is becoming fairly well known as a result of special surveys since 1920.
b) A broad, week-defined ridge-the Mid- Atlantic ridge- runs north and south between Africa and the two Americas.
e) The topography of the ocean floors in none too well known, since in great areas the available sounding are hundreds of even thousands of miles apart.