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Write a short note about a ocean not having a trench answer for class 5best answer gets a brainlist mark |
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Answer» Oceanic trenches are topographic depressions of the SEAFLOOR, relatively narrow in width, but very long. These oceanographic features are the deepest parts of the ocean floor. Oceanic trenches are a distinctive morphological feature of convergent PLATE boundaries, along which lithospheric plates move towards each other at rates that vary from a few millimeters to over ten CENTIMETERS per year. A trench marks the POSITION at which the flexed, subducting slab begins to descend beneath another lithospheric slab. Trenches are GENERALLY parallel to a volcanic island arc, and about 200 km (120 mi) from a volcanic arc. Oceanic trenches typically extend 3 to 4 km (1.9 to 2.5 mi) below the level of the surrounding oceanic floor. The greatest ocean depth measured is in the Challenger Deep of the Mariana Trench, at a depth of 11,034 m (36,201 ft) below sea level. Oceanic lithosphere moves into trenches at a global rate of about 3 km2/yr.[1] |
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