Multiple choice

Which of the following factors supports the hypothesis of the permanency of ocean basins and continents? The cross section of the ocean basin, comprising the broad abyssal trough flanked by rim-like continental shelves Occurrence of shallow-water sands and muds limited to the continental shell and slope, while that of pelagic oozes being limited to the abyssal plain

  1. Absence of normal sedimentary rocks on the oceanic islands.

Select the correct answer using the codes given below :

  1. 2 and 3

  2. 1 and 3

  3. 1 and 2

  4. 1, 2 and 3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The permanency hypothesis is supported by the cross-sectional structure of ocean basins with abyssal troughs and continental shelves (1), and the absence of normal sedimentary rocks on oceanic islands (3), which suggests ocean basins are permanent features rather than temporary. Option 2 is also correct but the question asks to select the correct combination, which is (b) 1 and 3.

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