Geography • World GeographyHard
Evaluate the morphological and hydrological features of major oceanic trenches and marginal seas: Statement I: The Mariana Trench, containing the Challenger Deep, is the deepest known depression on Earth, formed at a convergent plate boundary where the Pacific Plate subducts beneath the Mariana Plate. Statement II: Marginal seas such as the Bering Sea and the South China Sea are partially enclosed by island arcs or continental landmasses and are situated entirely upon deep abyssal ocean floors. Which of the following is correct?
A. Only Statement I is correct✓ Correct Answer
B. Only Statement II is correct
C. Both Statement I and Statement II are correct
D. Neither Statement I nor Statement II is correct
💡 Solution & Explanation
Statement I is correct because the Mariana Trench represents the ultimate depth of the world ocean, created by the subduction of old, cold Pacific lithosphere. Statement II is incorrect because marginal seas sit largely upon shallow continental shelves rather than deep abyssal plains, even though some basins may feature deeper trenches. Understanding marginal sea dynamics is critical for marine resource management and coastal oceanography.
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