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  Encyclopedia of Keywords > Time > Events > Earthquakes > Subduction > Trench   Michael Charnine

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  1. A trench is a ditch, between 1.5m and 1.8m deep with a stone parapet and sandbags to protect the soldiers and allow them to shoot from a dominant position.
  2. A trench is a type of excavation or depression in the ground.
  3. A trench is a steep-walled valley on the sea floor adjacent to a continental margin.
  4. A trench is formed where the oceanic plate dives below (is subducted by) the (less dense) overriding plate.
  5. A trench is formed where the under-sliding plate tips down, and the ocean-floor sediment it carries is scraped off against the front of the overriding plate.

Rocky Mountain Trench

  1. Entering the Rocky Mountain Trench you are surrounded to the north by the steeply rising Rocky Mountains and to the south by the Cariboo Mountains.
  2. Mountains west of the Rocky Mountain Trench are also distinct ranges and not part of the Rockies.

Deep-Sea Trench

  1. When two plates come together under the ocean a deep-sea trench is formed.
  2. A deep-sea trench is a narrow, elongate, v-shaped depression in the ocean floor.

Subducting Plate

  1. Magma rises from the subduction zone, and a trench forms where the subducting plate sinks.

Oceanic Trenches

  1. Subduction causes oceanic trenches, such as the Mariana trench.


  1. The "parados" protected the soldier's back from shrapnel from shells falling behind the trench.


  1. Moat - A deep trench usually filled with water that surrounded a castle.
  2. Moat: A deep, wide trench, often filled with water, that served as a barrier around a fortified castle.

North American Plate

  1. It formed as a result of subduction of the Pacific Plate beneath the North American Plate at the easternmost end of the Aleutian Trench.
  2. The Kuril Trench has been formed by the subduction of the Pacific plate under the North American plate.

Deepest Part

  1. The deepest part of the Aleutian trench has been measured at 7,679 meters (25,194 ft).

Trench Systems

  1. At the Battle of Sevastopol, Red Army forces successfully held trench systems on the narrow peninsula for several months against intense German bombardment.

Trench System

  1. The front bunker of a trench system usually includes machine gun s or mortars and forms a dominant shooting post.
  2. Together, the volcanoes and trench form an intra-oceanic island arc and trench system.

Cure Trench Mouth

  1. This simple action could advance the wellbeing of your mouth and become a part of your venture to cure trench mouth.

Marianas Trench

  1. Although shallower than the Marianas Trench, the Puerto Rico Trench is as impressively deep as Mount Everest is high.
  2. Typically, a deep oceanic trench, such as the Marianas Trench, bounds an island arc on the oceanic side beyond the fore-arc basin.
  3. Barophilic marine microbes have been found at more than 10 km (6 mi) depth in the Marianas Trench (Takamia et al., 1997, in FEMS Microbiology Letters).

Peru-Chile Trench

  1. The boundary between the two plates is marked by the Peru-Chile Trench.
  2. Significant oceanic trenches in this region are the Middle America Trench in the North Pacific and the Peru-Chile Trench in the South Pacific.
  3. The same telluric displacements that created the Peru-Chile Trench make the country highly prone to earthquakes.

Trench Mouth

  1. This fundamental action would boost the wellness of your mouth and be a part of your efforts to treat your trench mouth.
  2. Poor hygiene also led to fungal conditions, such as trench mouth and trench foot.


  1. The Marianas Trench, where the enormous Pacific Plate is descending under the leading edge of the Eurasian Plate, is the deepest sea floor in the world.


  1. Cf. Countervallation.] (Fort.) A trench guarded with a parapet, constructed by besiegers, to secure themselves and check sallies of the besieged.


  1. He pinned down the Confederate army in the Siege of Petersburg, where the two armies engaged in trench warfare for over nine months.


  1. The Mariana Plate is a small tectonic plate located west of the Mariana Trench and forms the basement of the Mariana Islands.

Caribbean Plate

  1. Just north of the Nazca Plate, the oceanic Cocos Plate is being subducted under the Caribbean Plate and forms the Middle America Trench.
  2. The Puerto Rico trench is located where two plates, the North American plate and the Caribbean plate collide.
  3. The North American Plate is subducting the Caribbean Plate to the southeast of the trench.


  1. Thereafter the trench would require constant maintenance to prevent deterioration caused by weather or shelling.


  1. The boundary between these plates, called the Cascadia Subduction Zone, dips eastward beneath the Pacific Northwest at an offshore trench.
  2. We propose that the wedge represents sedimentary materials that were subducted in an offshore trench within the past 23 m.y.
  3. Immediately offshore along the Pacific coast of the peninsula runs the 10,500 meter deep Kuril-Kamchatka Trench.


  1. Much of the war’s combat involved trench warfare, where hundreds often died for each yard of land gained.


  1. The eastern margin is a convergent boundary subduction zone under the South American Plate and the Andes Mountains, forming the Peru-Chile Trench.
  2. The origins of the word lie in digging a trench and forming the upcast soil into a bank alongside it.
  3. A predetermined resist pattern 9 for forming a trench is formed over the silicon nitride film 8.


  1. Gas lateral - The trench or area in the yard where the gas line service is located, or the work of installing the gas service to a home.


  1. The composition of the inner trench slope and a first-order control on trench morphology is determined by sediment supply.


  1. The North American plate, which descends into the trench, is broken into steps with vertical offsets from 0.5 to 1 km, and is sheared parallel to the trench.
  2. This often results in a chain of volcanoes running parallel to the trench.


  1. The chiefs were armed and at the trench before the horses got there, but these came up presently.

Sea Floor

  1. The unusually deep sea floor is not limited to the trench, but also extends farther south toward Puerto Rico.
  2. Where this occurs an oceanic trench forms on the sea floor and the sinking plate becomes a subduction zone.
  3. The best known example is the Marianas Trench where the sea floor plunges to more than 11 km depth.


  1. Convergent boundaries that occur between the ocean and land create continental margin arc and trench systems near the margins, or edges, of continents.
  2. There an evolution in trench morphology can be expected as oceans close and continents converge.


  1. More regionally along the Sunda Trench the pattern is one of convergence and subduction (Figure 8).
  2. This is not the circumstance for the Aleutian Trench, where the direction of convergence gradually changes westward, from normal to transform motion.


  1. The Philippine Sea plate subducts beneath the Eurasia plate at the Ryukyu Trench and is seismically active to depths of about 250 km.
  2. The deepest part of the Puerto Rico Trench, which has depths in excess of 8,000 meters (m), lies 150 km north of the island of Puerto Rico (Fig.


  1. An Armenian fighter firing an NSV heavy machine gun, often found on the turrets of tanks, in a trench in Hadrut in the summer of 1992.
  2. Combined arms warfare, where infantry, light artillery, and (if possible) tanks and aircraft operated in close cooperation made trench warfare obsolete.
  3. Tanks were first introduced by the British as a means to break the deadlock of trench warfare.

Aleutian Islands

  1. For example, the island arc associated with the Aleutian Trench is represented by the long chain of volcanoes that make up the Aleutian Islands.


  1. To the west farther from the sediment supply on Alaska, the trench reaches depths of more than seven kilometres.
  2. Trench (25,600 feet) extending from Alaska to the Kamchatka Peninsula; it results from the Pacific Plate sliding beneath the North American Plate.
  3. The oldest of the Emperor seamounts is about to subduct into the Aleutian trench off of Alaska; no one knows how many older volcanoes have already subducted.


  1. Where a trench occurs off continental margins, the turbidites from the slope are trapped, forming a hadal plain on the floor of the trench.
  2. The floor of the trench was usually covered by wooden duckboards.


  1. Another type of bunker or blockhouse is a little concrete post, partly dug into the ground, which is usually a part of a trench system.


  1. In this case, the location of the trench will migrate towards the magmatic arc over the life of the convergent margin.
  2. Both earthquakes occurred at approximately the same location where the Pacific Plate subducts the Okhotsk Plate at the Kuril-Kamchatka Trench.
  3. Detailed 3-D interpolated image showing the interaction of the Caribbean and North American Plates and the location of the Puerto Rico Trench.

First World War

  1. Owen is regarded by some as the leading poet of the First World War, known for his war poetry on the horrors of trench and gas warfare.
  2. Unlike the trench warfare of the First World War, the Polish-Soviet War was a conflict in which the cavalry 's mobility played a decisive role.

South America

  1. This supposedly causes a deep trench in the ocean off the coast of South America, and lifts the Andes mountains to the highest peaks in the Americas.
  2. Along the western coast of South America, the Peru-Chile trench marks where the Nazca plate is being subducted beneath the South American plate.


  1. The Marianas trench in the Pacific Ocean is created by the collision of the fast-moving Pacific Plate against the slower moving Philippine Plate.

Indian Ocean

  1. The Indian Ocean is also predicted to be smaller due to northward subduction of oceanic crust into the Central Indian trench.
  2. As an oceanographic survey ship Diamantina was responsible for discovering the deepest point in the Indian Ocean in 1961, which was named Diamantina Trench.

Sea Level

  1. This spot, about 34,440 feet (10,497 meters) below the sea level, is known as the Philippine Deep or the Mindanao Trench.
  2. Height: 4,897 metres (16,077 feet) The lowest point in Antarctica is within the Bentley Subglacial Trench, which reaches 2,540 meters below sea level.
  3. The deepest place on Earth is in the Mariana Trench, 11,022 m (36,152 ft) below sea level.


  1. It was fully surveyed in 1951 by the British naval vessel, "Challenger II" which gave its name to the deepest part of the trench, the " Challenger Deep ".
  2. They say the organisms have become adapted to the crushing pressures that exist in a location of the Marianas Trench known as Challenger Deep.
  3. The greatest ocean depth has been sounded in the Challenger Deep of the Marianas Trench, a distance of 10,911 m (35,798 ft) below sea level.


  1. The northwestward-moving Pacific plate is subducted along this megathrust beneath the North American Plate giving rise to the Aleutian trench and islands.
  2. The subducting Pacific Plate created the Kermadec Trench, an 8 km deep submarine trench, to the east of the islands.
  3. MasterMinds by Liverpool Echo (Liverpool, England) is the name of a deep oceanic trench in the Bahamas separating the islands of Andros and New Providence.

Pacific Ocean

  1. The deepest point in the ocean is the Marianas Trench located in the Pacific Ocean near the Northern Mariana Islands.
  2. To the west the Andes ends at the Pacific Ocean, although the Peru-Chile trench can be considerated its ultimate western limit.
  3. The deepest recorded measure to date is the Mariana Trench, near the Philippines, in the Pacific Ocean at 10924 m (35838 ft).


  1. The deepest point in the Atlantic, the trench marks the location where the North American plate is being subducted beneath the Caribbean Plate.
  2. The deepest point in the Atlantic at 28,200 feet lies in The Puerto Rico Trench.


  1. Time > Events > Earthquakes > Subduction
  2. Plates
  3. Encyclopedia of Keywords > Places > Earth > Ocean
  4. Liquids > Water > Islands > Puerto Rico
  5. Beneath

Related Keywords

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  Originally created: August 01, 2010.
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