Discussion
The process that creates the deep oceanic trenches is called
Answer: A
Deep oceanic trenches are produced by plate tectonics, specifically at subduction zones where one plate bends downwards beneath another. The Mariana Trench, nearly 11,000 m deep, is the deepest.
Sea-floor spreading is the complementary process at mid-ocean ridges, where crust is created rather than consumed, so it builds ridges rather than trenches.
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