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Oceanic floors
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.
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.
a) Closely spaced soundings show that many parts of the oceanic floors are as rugged as mountainous regions.
b) A broad, week-defined ridge-the Mid- Atlantic ridge- runs north and south between Africa and the two Americas.
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