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On a trench s outer slope the oceanic side the slope is gentle as the plate gradually bends into the trench.
Ocean floor underwater ocean trench. The trench is created when one of the plates slides below the lithospheric slab. Ocean trenches formed by this continental oceanic boundary are asymmetrical. With depths exceeding 6 000 meters nearly 20 000 feet. An american explorer has descended nearly 11km seven miles to the deepest place in the ocean the mariana trench in the pacific.
The types of rocks found in these ocean trenches are also asymmetrical. This article takes a look at some of the deepest oceanic trenches in the world. On the inner slope continental side the trench walls are much more steep. Where plates diverge from each other molten magma flows upward between the plates forming mid ocean ridges underwater volcanoes hydrothermal vents and new ocean floor crust.
These oceanographic features are the deepest parts of the ocean floor. Victor vescovo spent four. Ocean trenches are steep depressions in the deepest parts of the ocean where old ocean crust from one tectonic plate is pushed beneath another plate raising mountains causing earthquakes and forming volcanoes on the seafloor and on land. The marina trench which spans a total length of over 1 600 miles across the seabed with an average width of about 42 miles and its deepest point almost 7 miles below the ocean surface is located just off the arc shaped archipelago within the north western pacific ocean known as the marina islands.
The challenger deep is the. Oceanic trenches are topographic depressions of the sea floor relatively narrow in width but very long. Making multiple trips nearly 11 kilometers or seven miles to the ocean floor one of them four hours in duration vescovo set a record for the deepest solo dive in history his team said. Abyssal plains are key geologic elements of oceanic basins the.
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. As plates converge one plate may move under the other causing earthquakes forming volcanoes or creating deep ocean trenches. What are ocean trenches.
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