what are trenches?
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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 wider gully, or ditch), and narrow compared with its length (as opposed to a simple hole). In geology, trenches are created as a result of erosion by rivers or by geological movement of tectonic plates. In the civil engineering field, trenches are often created to install underground infrastructure or utilities (such as gas mains, water mains or telephone lines), or later to access these installations. Trenches have also often been dug for military defensive purposes.
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What Is The Definition Of Deep Ocean Trench? The deepest valley on earth is an ocean trench called the challenger deep, which part of mariana in pacific near guam. By comparison, mount everest stands at 29,026 feet (8,848 m) above sea level, meaning the deepest part of 2 sep 2017 Deep trench define oceanic dictionary. Googleusercontent search.
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Download the World War I Trench Facts & Worksheets Trench warfare is a type of fighting where both sides dig deep trenches in the ground as a defence against the enemy. The World War 1 trenches could stretch many miles and made it almost impossible for one side to advance on the other.
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Whats the purpose of trench's during ww1? To provide the soldiers with cover and concealment. With the advent of machine-guns, rapid firing, breech-loaded artillery, and accurate, rapid-firing bolt action rifles, movement in the open was very costly. The trenches allowed soldiers to protect themselves from the direct fire weapons and to some degree from the indirect weapons, too. However, the establishment of vast networks of interconnected trench networks made any sort of attack virtually impossible, thus causing stagnation.
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TRENCH Hyponyms (each of the following is a kind of trench): approach trench; communication trench (a trench that provides protected passage between the rear and front lines of a defensive position). fire trench (a trench especially constructed for the delivery of small-arms fire).
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Trench Mouth Trench mouth is a painful bacterial infection that involves swelling (inflammation) and ulcers in the gums (gingivae).
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ocean trench Ocean trenches are long, narrow depressions on the seafloor. These chasms are the deepest parts of the ocean—and some of the deepest natural spots on Earth. Ocean trenches are found in every ocean basin on the planet, although the deepest ocean trenches ring the Pacific as part of the so-called “Ring of Fire” that also includes active volcanoes and earthquake zones.
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TRENCH Primary Meanings of trench. 1  n any long ditch cut in the ground. 2  n a ditch dug as a fortification having a parapet of the excavated earth. 3  n a long steep-sided depression in the ocean floor. 4  v cut a trench in, as for drainage. 5  v fortify by surrounding with trenches. 6  v dig a trench or trenches. 7  v cut or carve deeply into.
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Ocean trenches - Mariana trench Ocean trenches are deep sections of the ocean where an oceanic plate is usually sinking below a continental plate. Some example of ocean trenches Mariana trench
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Trenches What are they? 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.
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- On this day in History, First trenches are dug on the Western Front on Sep 15, 1914. Learn more about what happened today on History.
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Directional Boring vs. Trenching-Which Is Right for Me? Excavation and trenching are among the most hazardous construction operations. OSHA defines an excavation as any man-made cut, cavity, trench, or depression in the earths surface formed by earth removal. A trench is defined as a narrow underground excavation that is deeper than it is wide, and is no wider than 15 feet (4.5 meters). Dangers of Trenching and Excavation.
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Exploring Deep Ocean Trenches Ocean trenches exist around the world and are routinely the deepest part of the ocean. They include the Philippine Trench, Tonga Trench, the South Sandwich Trench, the Eurasian Basin and Malloy Deep, the Diamantina Trench, the Puerto Rican Trench, and the Mariana.
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Oceanic trench Oceanic trenches typically extend 3 to 4 km (1.9 to 2.5 mi) below the level of the surrounding oceanic floor. The greatest ocean depth to be sounded is in the Challenger Deep of the Mariana Trench, at a depth of 11,034 m (36,201 ft) below sea level. Oceanic lithosphere moves into trenches at a global rate of about 3 km2/yr.
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Trenchless technology Trenchless technology. Trenchless technology is a type of subsurface construction work that requires few trenches or no continuous trenches. It is a rapidly growing sector of the construction and civil engineering industry.
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Trenches The deepest trench in the world, the Mariana Trench located near the Mariana Islands, is 1,580 miles long and averages just 43 miles wide. It is home to the Challenger Deep, which, at 10,911 meters (35,797 feet), is the deepest part of the ocean.ceanic trenches, such as the Puerto Rico trench, are long, narrow topographic depressions of the seabed. The deepest parts of the ocean floor, they define one of the most important natural boundaries on the Earth's solid surface: the one between two lithospheric plates.
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- A trench is an excavation defined by its depth being greater than its width. The U.S. Occupational Safety and Health Administration, or OSHA, says that trenches have many safety hazards that trench workers must be wary of. To protect workers from accidents and injuries, trench depth standards are set by OSHA.
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TRENCH trench. n. 1. a deep ditch or furrow. 2. (Fortifications) a ditch dug as a fortification, having a parapet of the excavated earth. vb.
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Trench warfare Trench warfare, warfare in which opposing armed forces attack, counterattack, and defend from relatively permanent systems of trenches dug into the ground. The opposing systems of trenches are usually close to one another. Trench warfare is resorted to when the superior firepower of the defense compels the opposing forces to “dig in” so extensively as to sacrifice their mobility in order to gain protection. zoom_in.
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Tsunami warning downgraded after major earthquake hits off Alaska A powerful earthquake of magnitude 7.9 struck off the coast of Alaska early Tuesday, prompting tsunami warnings down the Canadian coast, California and Hawaii. Officials at the National Tsunami Center canceled the warnings after a few tense hours, after waves failed to show up in coastal Alaskan communities. No serious damage was reported.
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- Deep-sea trench: Deep-sea trench, any long, narrow, steep-sided depression in the ocean bottom in which occur the maximum oceanic depths, approximately 7,300 to more than 11,000 metres
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Overview Trench mouth, also known as necrotizing ulcerative gingivitis (NUG), is a severe form of gingivitis that causes painful, infected, bleeding gums and ulcerations. Trench mouth is rare today in developed nations, though it's common in developing countries that have poor nutrition and poor living conditions.
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Ocean Trenches Ocean Trenches. Introduction. Ocean trenches are natural tectonic plate boundaries between two crustal plates. When a continental plate converges with an oceanic plate a subduction zone forms. The heavier oceanic plate subducts beneath the lighter continental plate forming a trench.
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TRENCH 4. set, plant, or bury in a trench. 5. cut a trench in, as for drainage. 6. dig a trench or trenches. Familiarity information: TRENCH used as a verb is common.
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What Happens in Deep Ocean Trenches? According to Science Daily, the most significant geological event that happens in ocean trenches is the gradual subduction of the Earth's crust down into its mantle. This process takes tens of...
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- Trenching and Excavation Safety. Excavation and trenching are among the most hazardous construction operations. OSHA defines an excavation as any man-made cut, cavity, trench, or depression in the earth’s surface formed by earth removal. A trench is defined as a narrow underground excavation that is deeper than it is wide, and is no wider than 15 feet (4.5 meters). Dangers of Trenching and Excavation Cave-ins pose the greatest risk and are much more likely than other excavationrelated accidents to result in worker fatalities.