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A gas main being laid in a trench. A trench is a type of excavation or depression in the ground that is generally deeper than it is wide (as opposed to a swale or a bar ditch), and narrow compared with its length (as opposed to a simple hole or pit). [1] In geology, trenches result from erosion by rivers or by geological movement of tectonic ...
An individual trench can be thousands of kilometers long. [3] Most trenches are convex towards the subducting slab, which is attributed to the spherical geometry of the Earth. [21] The trench asymmetry reflects the different physical mechanisms that determine the inner and outer slope angle.
ocean trench A long, narrow, very deep depression in the ocean floor at the junction of two tectonic plates, where one plate is subducted steeply beneath the other, often penetrating the mantle. A bathymetric map looking west across the Caribbean Sea. The purple area is the Puerto Rico Trench, the deepest trench in the Atlantic Ocean. oceanography
In geology, a depression is a landform sunken or depressed below the surrounding area. Depressions form by various mechanisms. ... Oceanic trench: a deep linear ...
Location map Puerto Rico Trench—United States Geological Survey Perspective view of the sea floor of the Atlantic Ocean and the Caribbean Sea. The Lesser Antilles are on the lower left side of the view and Florida is on the upper right. The purple sea floor at the center of the view is the Puerto Rico Trench, the deepest part of the Atlantic ...
At the triple junction each of the three boundaries will be one of three types – a ridge (R), trench (T) or transform fault (F) – and triple junctions can be described according to the types of plate margin that meet at them (e.g. fault–fault–trench, ridge–ridge–ridge, or abbreviated F-F-T, R-R-R).
Marine geology or geological oceanography is the study of the history and structure of the ocean floor. It involves geophysical, geochemical, sedimentological and paleontological investigations of the ocean floor and coastal zone. Marine geology has strong ties to geophysics and to physical oceanography.
Graben is a loan word from German, meaning 'ditch' or 'trench'. The first known usage of the word in the geologic context was by Eduard Suess in 1883. [ 1 ] The plural form is either graben [ 2 ] or grabens .