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Oceanic trench
The oceanic trenches are several hundred kilometres long but narrow topographic depressions of the sea floor. They also are the deepest parts of the ocean floor. A trench marks the position at which the flexed, subducting slab begins to go under, on the convex side and between 50 and 250 km from a volcanic arc. Oceanic trenches typically extend 3 to 4km (1.9-2.5 mi) below the level of the surrounding oceanic floor. The deepest ocean depth to be sounded is in the Challenger Deep of the Mariana Trench at a depth of 10,991m (35,798 ft) below sea level.
Major oceanic trenches
- Aleutian Trench
- Cayman Trench (max depth 7,686 m)
- Japan Trench (max depth 9,000 m)
- Kermadec Trench
- Kuril Trench
- Mariana Trench (max depth 10,924 m)
- Middle America Trench
- Peru-Chile Trench (max depth 8,065 m)
- Puerto Rico Trench
- Ryukyu Trench (Nansei-Shoto Trench)
- Sunda Trench
- Tonga Trench (max depth 10882 m)
See also
03-10-2013 05:06:04
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details
The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details