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OCEANIC TRENCH

     An oceanic trench is a long depression diving, deep and long, along continents or volcanic islands, resulting from the subduction or divergence caused by the collision or the expansion of tectonic plates.

Map of the main oceanic trenches of the world ocean.


This map shows the major oceanic trenches of the ocean on a global level in the World Ocean.

It is also said pit abysmal, underwater grave for oceanic trenches which are hemispherical, long but narrow topographic depressions of the sea floor. These pits, these breaks are also the deepest parts of the ocean. The oceanic trenches are a distinguishing feature of the convergence morphology borders of tectonic plates.

Along the borders of converging plates, the plates move together at speeds which vary from a few mm to over ten centimeters per year. An oceanic trench marks the position at which the bending, the subduction slab begins to descend beneath another lithospheric slab. The trenches are generally parallel to a volcano-shaped island arc, and about 200 km from a volcanic arc.

Ocean trenches typically extend from 3 to 4 km below ground level surrounding the ocean environment. The greatest depth of the ocean is at Challenger Deep of the Mariana Trench at a depth of 11,033 m (previously 10 924 m) below sea level. The displacement of the oceanic lithosphere in the trenches is a global rate of about 3 km2 / year.

Bathymetric map of ocean Mariana Trench:

The fabulous ocean Mariana Trench in the North Pacific Ocean holds the depth record with a point for abyssal 10924 meters, but now measured at 11,033 m!

The 10 pits and oceanic trenches are:

- The Mariana Trench, 11,033 meters in the Pacific Northwest, in the east of the Mariana Islands
- The Tonga Trench, 10,882 meters, near Tonga in the Pacific Ocean
- The pit of the Kuril-Kamchatka, 10,542 m, near the Kuril Islands in the western North Pacific Ocean
- The Philippine Trench, 10,540 m ,, east of Philipinnes
- The Kermadec Trench, 10,047 meters, also in the Pacific Ocean, north-east of New Zealand
Pit Izu Bonin and Izu Ogasawara, 9780 m, which resulted in - - The Nanpo archipelago, near Bionin and Izu islands in the Pacific
- The Japan Trench, 9000 m, northeast of Japan and home to species of fish known as one of the deepest, Pseudoliparis amblystomopsis
- The pit of Puerto Rico with 8800 meters is the deepest of the Atlantic Ocean, located at the border of the Caribbean Sea and western Atlantic Ocean
Pit Atacama (or Peru-Chile), 8065 m to the east of the Pacific Ocean, off the coast of Chile and Peru;
- The Aleutian Trench, 7679 m, west of Alaska

Closer to Europe, it is the pit Calypso, in the Mediterranean Sea which reaches a maximum depth of 5 267 m, which holds the bathymetric record.

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