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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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| However, he adds, crabs live in habitats ranging from terrestrial environments to ocean trenches, thus the universal benefit of a crablike shape remains an enigma. Unlike most other such volcanoes, which develop above rising blobs of salt or near ocean trenches, the Hakon Mosby has no clear geologic feature forcing the mud to erupt at the surface. A massive earthquake that struck the seafloor south of New Zealand in May appears to have signaled the very early stages of subduction there -- the same process that long ago created deep ocean trenches around the Pacific. |
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