junna_cherfils. Find the answers with Practical English Usage … The bathymetry of the ocean was of no real interest until the late 19th and early 20th centuries, with the initial laying of Transatlantic telegraph cables on the seafloor between the continents. Oceanic trenches are a distinctive morphological feature of convergent plate boundaries, along which lithospheric plates move towards each other at rates that vary from a few millimeters to over ten centimeters per year. oceanography synonyms, oceanography pronunciation, oceanography translation, English dictionary definition of oceanography. (The Mariana Trench off the coast of Guam is … We often think of Earth in terms of its land area, but in reality 71% of the Earth’s surface is covered by oceans, while only 29% is land. Definition. Introduction DEFINITIONS OF OCEANOGRAPHY:- • According to H.A. The environmental conditions at such a depth as that of ocean trenches is quite adverse. The pressure at the trenches goes as high as 1,000 times the pressure at the surface. There is almost no light reaching up to that depth, and it is pitch black down in the chasms of the trenches. Oceanography Oceanic trench An oceanic trench is a long, deep and wide depression bordering continents or volcanic archipelagos , resulting from subduction . All Free. One of these features found under the oceans is the ocean trench. Mariana Trench. Definition. Even then the elongated bathymetric expression of trenches was not recognized until well into the 20th century. Trenches form when one tectonic plate slides beneath another plate at a subduction zone. See also The Mariana Trench is located in the Pacific Ocean, just east of the 14 Mariana Islands (11"21' North latitude and 142" 12' East longitude ) near Japan. oceanography trench strait tidewater cross-current marine current Show all entries from Topic: Oceanography The depth at which the rate of accumulation of calcareous sediments equals the rate of dissolution of those sediments. What are ocean trenches? Ocean trenches are steep depressions in the deepest parts of the ocean [where old ocean crust from one tectonic plate is pushed beneath another plate, raising mountains, causing earthquakes, and forming volcanoes on the seafloor and on land. n. The exploration and scientific study of the ocean and its phenomena. These oceanographic features are the deepest parts of the ocean floor. A trench forming part of a line of strongpoints in the rear of the trench /trentʃ/ noun [ countable] 1. Brian_M1. The ocean churns up various types of currents. 2 technical. Figure 4.6.2 A trench and volcanic mountains formed from an ocean-continent convergent zone (Steven Earle, “Physical Geology”). ∎ (the trenches) the battlefields of northern France and Belgium in World War I: the slaughter in the trenches created a new cynicism | fig. trench. The trenches are formed due to tectonic forces—either by down faulting or by done folding. South-west of Fiordland, the Puysegur Trench marks the zone where the oceanic crust of the Australian Plate plunges beneath the Pacific Plate. n. (Geological Science) a long narrow steep-sided depression in the earth's oceanic crust, usually lying above a subduction zone. Questions about grammar and vocabulary? HEO. It is rigid and floats above the asthenosphere. A trench marks the position at which the flexed, subducting slabbegins to descend beneath another lithospheric slab. Start studying Oceanography - Sediments - Chapter 5. The term “trench” does not appear in Murray and Hjort’s (1912) classic oceanography book. A trench is a deep and narrow hole, or ditch, in the ground, like the kind soldiers on frontlines might dig to give themselves shelter from the enemy. A long narrow and steep-sided depression on the ocean floor is called a trench. The British Royal Navy's efforts to chart all of the world's coastlines in the mid-19th century reinforced the vague idea tha… Slip vectors from thrust earthquakes at subduction zones where convergence is oblique to the trench often point between the directions of relative plate convergence and normal to the trench axis, suggesting that oblique convergence is taken up by partial decoupling. What is the definition of SUPPORT TRENCH? a long narrow valley in the ground beneath the sea 3. a long narrow hole dug into the surface of the ground Workers dug a trench for gas lines. At this location, the scientists measured a depth of 26,850 feet! This motion of plates result in different topological features on the Earth. June 2021. Look it up now! Puerto Rico Trench - WordReference English dictionary, questions, discussion and forums. What is the meaning of SUPPORT TRENCH? More rarely, ocean trenches can be formed when two plates carrying oceanic crust meet. The Mariana Trench, in the South Pacific Ocean, is formed as the mighty Pacific plate subducts beneath the smaller, less-dense Philippine plate. Definition of ocean-trench noun in Oxford Advanced Learner's Dictionary. They generally … 25 terms. Humans first acquired knowledge of the waves and currents of the seas and oceans in pre-historic times. Studying the swift, smart, and shy: Unobtrusive camera-platforms for observing large deep-sea squid - Open access. Synonyms for Ocean Trench in Free Thesaurus. The plate boundary is defined by the trench axis itself. Beneath the inner trench wall, the two plates slide past each other along the subduction decollement, the seafloor intersection of which defines the trench location. The overriding plate contains volcanic arc (generally) and a forearc. Below The deepest depth recorded by the Expedition was located in the Marianas Trench, a place now known as the Challenger Deep. William Broad in his publication, The Universe Below (1997), recalls the words of another naturalist on board, Henry Mosely, who describes the evolution of feeling about this type of work. trench in Oceanography topic. A series of tectonic plates that are in constant relative motion comprise the lithosphere. NHT stands for New Hebrides Trench (oceanography) Suggest new definition This definition appears somewhat frequently and is found in the following Acronym Finder categories: What are synonyms for SUPPORT TRENCH? Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. The oceanic mixed layer is the warm layer on the ocean surface that maintains a homogeneous temperature. Most Downloaded Deep-Sea Research Part I: Oceanographic Research Papers Articles. Mid-Atlantic Ridge. Artic basin. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Upgrade to remove ads. Instead they applied the term a continuous underwater mountain range that winds through every ocean basin in the world and resembles the seam on a baseball. Trenc… Almost nothing was known of the ocean depths. How do you use SUPPORT TRENCH in a sentence? trench: see ocean ocean,interconnected mass of saltwater covering 70.78% of the surface of the earth, often called the world ocean. It is entirely volcanic in origin, wraps on-and-a-half times around the globe, and rises more than 2.5 km about the … It is believed to work by density. subduction, a long narrow and very deep trench may be created. Together, these larger and more permanent currents make up the systems of currents known as gyres. A gyre is a large system of rotating ocean currents. Definition of Oceanography 1. Term. trench. It is subdivided into four (or five) major units that are separated from each other in most cases by the continental masses. is called as ocean trench. From Longman Dictionary of Contemporary English. Pacific Ring of Fire. Alternative Title: oceanic trench. Oceanic trough, an elongate depression in the seafloor that is characteristically shallower, shorter, narrower, and topographically gentler than oceanic trenches. Only $2.99/month. Great Barrier Reef. Ocean trenches are typically caused when an oceanic crustal plate slides under a lighter continental plate or another oceanic plate. ocean trench ocean trench Ocean trenches are long, narrow depressions on the seafloor. These plates, found on the outer layer of the earth, can move and meet with other plates at their boundaries. Oceanography is the study of the world's oceans, and includes aspects of chemistry, biology, physics, geology, and many more basic science disciplines. Atlantic basin. Define oceanography. oceanography chapter 1. Mid Ocean Ridges. The Tonga Trench is the second-deepest trench in the world, reaching 35,700 feet (about 10,900 meters) at its deepest point. The topography is not as dramatic as the Kermadec Trench, as the plates largely slide north–south past one another, rather than over and under. Oceanography definition is - a science that deals with the oceans and includes the delimitation of their extent and depth, the physics and chemistry of their waters, marine biology, and the exploitation of … Maximal depths of oceanic troughs range between 2,300 m (7,500 feet) in the Papuan Trough and 7,440 Abyssal Plains. HOLE. Primitive study of … A long, steep-sided valley on the ocean floor. Since, it is inside the oceans, it. oceanic trench. Indian basin. Definition. Antonyms for Ocean Trench. Ocean trenches have relatively steep sides falling to the ocean floor. Located 4,000 to 6,000m below the ocean surface. Pacific basin. Key Terms Geological Oceanography. A natural trench may also be a deep hole on the bottom of the ocean. They are deepest parts of the ocean floor and usually 5500 metres deep. Oceanic trenches are topographic depressions of the seafloor, relatively narrow in width, but very long. ∎ such a ditch dug by troops to provide a place of shelter from enemy fire. The continental slope extends from the outer edge of the continental shelf down to the ocean floor. Definition from Wiktionary, the free dictionary Jump to navigation Jump to search English [] English Wikipedia has an article on: oceanic trench Wikipedia Noun [] oceanic trench (plural oceanic trenches) (geology, oceanography) A hemispheric-scale long but.
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