What Is The Definition Of Trench

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What is the definition of trench in science?

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 or pit). In geology trenches result from erosion by rivers or by geological movement of tectonic plates.

What is a trench simple definition?

English Language Learners Definition of trench

: a long narrow hole that is dug in the ground : ditch. : a deep narrow hole in the ground that is used as protection for soldiers. : a long narrow hole in the ocean floor.

What is an example of trench?

A long narrow ditch dug in World War I to protect troops from being seen by the enemy is an example of a trench. Trench means to dig a long and narrow ditch. When you dig a long narrow ditch to place a pipe this is an example of a time when you trench. … A deep furrow or ditch.

What is the meaning of the name trenches?

English and Scottish (of French origin): habitational name from La Tranche in Poitou so named from the Old French topographical term trenche a derivative of the verb trenchier ‘to cut’ which denoted both a ditch and a track cut through a forest.

What is trench in geography?

Trenches are long narrow depressions on the seafloor that form at the boundary of tectonic plates where one plate is pushed or subducts beneath another.

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What is in a trench?

Trenches were long narrow ditches dug into the ground where soldiers lived. They were very muddy uncomfortable and the toilets overflowed. These conditions caused some soldiers to develop medical problems such as trench foot. … In the middle was no man’s land which soldiers crossed to attack the other side.

What is trenching in mining?

Trenches are usually employed to expose steep-dipping bedrock buried below shallow overbur-den and are normally dug across the strike of the rocks or mineral zone being tested. Pitting and trenching are used to see a more complete picture of the rock.

What is a trench oceanography?

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. … At many convergent plate boundaries dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction creating a trench.

What is trench work?

Trenching is a specific form of excavation work it involves a precise narrow excavation (in relation to its length) made below the surface. Generally speaking the depth of the trench is bigger than its width but the width doesn’t exceed 15 feet.

What is the deepest trench on Earth?

The Mariana Trench
The Mariana Trench in the Pacific Ocean is the deepest location on Earth. According to the Exclusive Economic Zone (EEZ) the United States has jurisdiction over the trench and its resources.

What is the main purpose of a trench?

Trenches provided protection from bullets and shells but they did carry their own risks. Trench foot trench fever dysentery and cholera could inflict casualties as readily as any enemy.

What is a common trench?

Joint trenching is the practice of burying different utilities together in one trench. … Also called common trenching the practice has several advantages including cost savings and the relief of underground congestion in areas of high development.

What is the meaning of trench kid?

definition 1: a deep narrow ditch. … definition 3: a long narrow part of the ocean floor that is much deeper than the area on either side of it. A trench is like a deep dent or cut in the floor of the ocean.

What is the trench family name?

Trench is a surname. The Trench family supposedly originated in County Galway Ireland as descendants of Frederic de la Tranche a 16th-century Huguenot immigrant from Normandy and his wife Margaret Sutton a possible Northumbrian.

What is the name of a trench?

Deepest oceanic trenches
Trench Ocean Maximum Depth
Mariana Trench Pacific Ocean 10 920 m (35 830 ft)
Tonga Trench Pacific Ocean 10 820 m (35 500 ft)
Philippine Trench Pacific Ocean 10 540 m (34 580 ft)
Kuril–Kamchatka Trench Pacific Ocean 10 542 m (34 587 ft)

How was the Tonga Trench formed?

Like other deep ocean trenches the Tonga Trench began to form millions of years ago in a process called subduction which is when two tectonic plates grind together forcing one under the other. In this case the edge of the Pacific plate was forced under the Tonga plate a process still going on today.

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How deep is the Puerto Rican trench?

According to NOAA: The deepest part of the Puerto Rico Trench is just over 8 600 meters (5.3 miles).

How does Philippine trench formed?

The trench formed from a collision between the Palawan and Zamboanga plates. This caused a change in geological processes going from a convergent zone to a subduction zone. The subduction zone is located west to east of the Philippine Islands. … It hit the trench with a hypocenter depth of 34.9 km.

How deep is a trench?

deep-sea trench also called oceanic 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 (24 000 to 36 000 feet). They typically form in locations where one tectonic plate subducts under another.

What mean trench excavation?

TRENCH: An excavation in which material removal forms a narrow opening in the ground. Unlike large excavations a trench is generally deeper than it is wide. OSHA considers an excavation to be a trench if it is 15 feet wide or less at the bottom of the excavation.

What are the 4 types of trenches?

  • Front-line Trench. This type of trench was also known as the firing-and-attack trench. …
  • Support Trench. This trench was several hundred yards behind the front-line trench. …
  • Reserve Trench. The reserve trench was several hundred yards behind the support trench. …
  • Communication Trench.

What is trenching in mineral exploration?

Trenches or pits may be dug by mechanical excavators as part of mineral exploration or mining permits. Trenches and pits may be dug when areas of earth containing minerals are shown to be present and need further testing. The trenches or pits are typically back-filled after testing.

What is the difference between pit and trench?

A pit was defined as a single excavation circular in appearance with well-defined edges and where the ratio between the length and the width of the excavation did not exceed two. A trench was defined as an elongated and continuous excavation with well-defined edges and at least two times longer than its width.

What are in mines?

Ores recovered by mining include metals coal oil shale gemstones limestone chalk dimension stone rock salt potash gravel and clay. Mining is required to obtain most materials that cannot be grown through agricultural processes or feasibly created artificially in a laboratory or factory.

How deep are deep sea trenches?

deep-sea trench also called oceanic 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 (24 000 to 36 000 feet). They typically form in locations where one tectonic plate subducts under another.

What lives in deep sea trenches?

The three most common organisms at the bottom of the Mariana Trench are xenophyophores amphipods and small sea cucumbers (holothurians) Gallo said. The single-celled xenophyophores resemble giant amoebas and they eat by surrounding and absorbing their food.

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Why is deep sea trench is important?

They also are the deepest parts of the ocean floor. Trenches define one of the most important natural boundaries on the Earth’s solid surface that between two lithospheric plates. … A trench marks the position at which the flexed subducting slab begins to descend beneath another lithospheric slab.

Why are trenches full of water?

Much of the land where the trenches were dug was either clay or sand. … The water could not pass through the clay and because the sand was on top the trenches became waterlogged when it rained. The trenches were hard to dig and kept on collapsing in the waterlogged sand.

What is trench safety?

When done safely trenching operations can reduce worker exposure to other potential hazards include falls falling loads hazardous atmospheres and incidents involving mobile equipment. … Trenches 5 feet (1.5 meters) deep or greater require a protective system unless the excavation is made entirely in stable rock.

What is trenching in entomology?

Trenching is a strategy of herbivorous insects for avoiding ingestion of toxic phloem latex. … The isolated semi-circular area is cleared from phloem latex as demonstrated by a cut from which no exudate emerges (left arrow head).

Whats at the bottom of the Mariana Trench?

Toward the southern end of the Mariana Trench lies the Challenger Deep. It sits 36 070 feet below sea level making it the point most distant from the water’s surface and the deepest part of the Trench. … Don Walsh reached the Challenger Deep in a U.S. Navy submersible.

Has a human been to the bottom of the Mariana Trench?

On 23 January 1960 two explorers US navy lieutenant Don Walsh and Swiss engineer Jacques Piccard became the first people to dive 11km (seven miles) to the bottom of the Mariana Trench.

Is the Mariana Trench a body of water?

The Mariana Trench or Marianas Trench is located in the western Pacific Ocean about 200 kilometres (124 mi) east of the Mariana Islands it is the deepest oceanic trench on Earth.

How were trenches built?

The WWI trenches were built as a system in a zigzag pattern with many different levels along the lines. … Sometimes the soldiers would simply dig the trenches straight into the ground – a method known as entrenching. Entrenching was fast but the soldiers were open to enemy fire while they dug.

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