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The flattest and smoothest regions of the world, 3,000 to 6,000 m deep, are the:

AContinental shelves
BMid-ocean ridges
COceanic trenches
DDeep sea plains
Answer & Solution
Correct answer: D. Deep sea plains
1. They are covered with clay and silt. 2. These are the deep sea plains. 3. They slope very gently. _Source: NCERT Class 11 Fundamentals of Physical Geography, Chapter 13, Water (Oceans)._
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