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trench |
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trench: see ocean ocean, interconnected mass of saltwater covering 70.78% of the surface of the earth, often called the world ocean. It is subdivided into four (or five) major units that are separated from each other in most cases by the continental masses. See also oceanography . ..... Click the link for more information. . trench [trench] (geography) A narrow, straight, elongate, U-shaped valley between two mountain ranges. A narrow stream-eroded canyon, gulley, or depression with steep sides. (geology) A long, narrow, deep depression of the sea floor, with relatively steep sides. Also known as submarine trench. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| In other areas of the world, this type of motion, called subduction, carves a deep ocean trench. The part of the subduction zone which is close to New Caledonia is marked by the New Hebrides ocean trench. Shock waves radiating from the miniature depth-charges create localized pressures approaching those of the deepest ocean trench. |
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