What is the meaning of trench in science? a long, narrow excavation in the ground, the earth from which is thrown up in front to serve as a shelter from enemy fire or attack. trenches , a system of such excavations, with their embankments, etc. a deep furrow, ditch, or cut.
What is the meaning of trench in science?
noun. 1. 1. A long, steep-sided valley on the ocean floor. Trenches form when one tectonic plate slides beneath another plate at a subduction zone. The Marianas Trench, located in the western Pacific east of the Philippines, is the deepest known trench (10,924 m or 35,831 ft) and the deepest area in the ocean. 1.
What is a trench in science?
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 does trench mean?
Define trench. trench synonyms, trench pronunciation, trench translation, English dictionary definition of trench. n. 1. A deep furrow or ditch. 2. A long narrow ditch embanked with its own soil and used for concealment and protection in warfare. 3. A long, steep-sided...
What does trenches mean?
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. What does it mean for someone to be in the trenches?
What is trench give an example?
A long narrow ditch dug in World War I to protect troops from being seen by the enemy is an example of a trench. noun. 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.
What is trenching in biology?
Trenching cuts carbon supply from trees to blocks of soil so as to estimate relative contributions of autotrophic and heterotrophic respiration to the total soil respiration.
What is the meaning of trench in a sentence?
Meaning: [trentʃ] n. 1. a ditch dug as a fortification having a parapet of the excavated earth 2. a long steep-sided depression in the ocean floor 3. any long ditch cut in the ground.
What type of word is trenches?
The verb trench means to dig or to cut into, but you will most often hear the word as a noun, particularly relating to soldiers.
What is a trench underwater?
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.
What is trenching in agriculture?
Trenching is one of the major engineering measures for erosion control in non-arable lands and is mainly aimed to slope stabilization and drainage line treatment. The area with steep slope e.g. hilly region, are prone to soil erosion due to lack of vegetative cover and accelerated transportation of soil.
What causes a trench?
Trenches are formed through subduction, which occurs when tectonic plates collide and push one plate beneath the other. Trenches can be found all over the surface floor of the ocean at subduction zones. The Mariana trench is the deepest known point in the ocean at over 35,000 feet deep.
How many trenches are there in the world?
Globally, there are over 50 major ocean trenches covering an area of 1.9 million km2 or about 0.5% of the oceans. Trenches are geomorphologically distinct from troughs.
What happens in the trenches?
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.
What is electrical trench?
Cable trenching is a method of laying cables into the ground by digging trenches. The cables are submerged underground via the trench and are then covered by a layer of earth, bitumen or concrete. Cable trenching, also known as underground cabling, became a popular method of installing cables in the early 90s.
What is trench in the ground?
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).
What is trench archaeology?
Archaeology. Archaeological trench on an English farm site. Tren ches are used for searching and excavating ancient ruins or to dig into strata of sedimented material to get a sideways (layered) view of the deposits – with a hope of being able to place found objects or materials in a chronological order.
Why are trenches used?
Trenches are used for searching and excavating ancient ruins or to dig into strata of sedimented material to get a sideways (layered) view of the deposits – with a hope of being able to place found objects or materials in a chronological order. The advantage of this method is that it destroys only a small part of the site (those areas where the trenches, often arranged in a grid pattern, are located). However, this method also has the disadvantage of only revealing small slices of the whole volume, and modern archeological digs usually employ combination methods.
How are trenches created?
Some trenches are created as a result of erosion by running water or by glaciers (which may have long since disappeared). Others, such as rift valleys or oceanic trenches, are created by geological movement of tectonic plates. Some oceanic trenches include the Mariana Trench and the Aleutian Trench.
What is trenching in civil engineering?
In civil engineering, trenches are often created to install underground utilities such as gas, water, power and communication lines. In construction, trenches are dug for foundations of buildings, retaining walls and dams, and for cut-and-cover construction of tunnels. In archaeology, the "trench method" is used for searching ...
How deep is the Mariana trench?
Some oceanic trenches include the Mariana Trench and the Aleutian Trench. The former geoform is relatively deep (approximately 10 kilometres (6.2 mi)), linear and narrow, and is formed by plate subduction when plates converge.
Why do soldiers occupy trenches?
In trench warfare, soldiers occupy trenches to protect them against weapons fire. Trenches are dug by use of manual tools such as shovels and pickaxes, or by heavy equipment such as backhoes, trenchers and excavators . For deep trenches, the instability of steep earthen walls requires engineering and safety techniques such as shoring.
Where is the deepest trench in the ocean?
Trenches form when one tectonic plate slides beneath another plate at a subduction zone. The Marianas Trench, located in the western Pacific east of the Philippines, is the deepest known trench (10,924 m or 35,831 ft) and the deepest area in the ocean.
Where is the Marianas trench?
The Marianas Trench, located in the western Pacific east of the Philippines, is the deepest known trench (10,924 m or 35,831 ft) and the deepest area in the ocean. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company.
What is trench in military terms?
trench. (trĕnch) n. 1. A deep furrow or ditch. 2. A long narrow ditch embanked with its own soil and used for concealment and protection in warfare. 3. A long, steep-sided valley on the ocean floor.
How deep was the trench in the Battle of the Somme?
A trench was dug three and a half feet wide, four feet eight inches deep, and eight feet long. View in context. D'Artagnan set out with his four companions, and followed the trench; the two Guards marched abreast with him, and the two soldiers followed behind.
What is a trench in the ground?
trench. 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 natural trench may also be a deep hole on the bottom of the ocean.
What is a trench for fire?
fire trench. a trench especially constructed for the delivery of small-arms fire. fosse, moat. ditch dug as a fortification and usually filled with water. slit trench. narrow trench for shelter in battle. type of: ditch. a long narrow excavation in the earth.
Why was trench warfare so popular?
The phrase trench warfare became popular around World War I, when technological advances in weapons changed the way that wars were fought. Today, you may have even own a trench coat, a kind of raincoat first worn by soldiers.
What is trench in war?
The definition of a trench is a long, narrow ditch sometimes dug by troops during wartime to hide from enemies. A long narrow ditch dug in World War I to protect troops from being seen by the enemy is an example of a trench. noun. 7. 0.
How deep was the trench in the trench?
His gaze dropped to the trench he had dug around the bush. A trench was dug three and a half feet wide, four feet eight inches deep, and eight feet long.
Where is the deepest trench in the ocean?
Trenches form when one tectonic plate slides beneath another plate at a subduction zone. The Marianas Trench, located in the western Pacific east of the Philippines, is the deepest known trench (10,924 m or 35,831 ft) and the deepest area in the ocean.
What is the trench between two plates?
A trench forms between the two plates in a subduction zone. Trenches are depression in the ocean floor. They are also the deepest part of the seafloor. Trenches form natural boundaries between two tectonic plates.
How many trenches are there on Earth?
There are 20 major trenches on Earth and 17 of these trenches can be found around the Pacific Ocean Basin. The Mariana Trench contains the Challenger Deep, which is the deepest known place on our planet.
What boundary is the trench between two tectonic plates?
Ocean Trenches. Ocean trenches develop in subduction zones at a convergent boundary between two tectonic plates. When a continental plate collides with an oceanic plate the oceanic plate is forced beneath the lighter continental plate.
What is the name of the mountain range that forms on the continental side of a trench?
Volcanic arcs. Volcanic mountain ranges form on the continental side of a trench where a continental and an oceanic plate converge. The mountain range is called a volcanic arc. If two oceanic crusts converge an island arc forms on the overriding plate parallel to the trench. Volcanic arcs and island arcs have volcanic mountains ...
Underwater Mountains and Valleys
Did you know that most of the surface of our planet is under the ocean, not above it? In fact, Earth is about 70% water, and that is mostly the ocean. Do you know how deep the ocean goes? If you were to put the tallest mountain on Earth into the deepest part of the sea, it wouldn't even stick out of the water.
What is the Ring of Fire?
The Ring of Fire is the ring-like shape that would be made if you drew a circular line going around the Pacific Ocean. It is called that because there are many volcanoes and earthquakes in those areas. Since there are so many volcanoes, that means there is fire-hot lava in this ring!
How Deep are Trenches?
The best-known trench is the Mariana Trench, and for some good reasons. The Mariana Trench is over 1,580 miles long, and almost seven miles deep! It is the deepest trench in the world. The next deepest trench is the Tonga Trench, which is also almost seven miles deep.
Overview
A trench is a type of excavation or 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. In civil engineering, trenches are often created to install underg…
Geology
Some trenches are created as a result of erosion by running water or by glaciers (which may have long since disappeared). Others, such as rift valleys or oceanic trenches, are created by geological movement of tectonic plates. Some oceanic trenches include the Mariana Trench and the Aleutian Trench. The former geoform is relatively deep (approximately 10 kilometres (6.2 mi)), linear and n…
Civil engineering
In the civil engineering fields of construction and maintenance of infrastructure, trenches play a major role. They are used for installation of underground infrastructure or utilities (such as gas mains, water mains, communication lines and pipelines) that would be obstructive or easily damaged if placed above ground. Trenches are needed later for access to these installations for service…
Military engineering
Trenches have often been dug for military purposes. In the pre-firearm era, they were mainly a type of hindrance to an attacker of a fortified location, such as the moat around a castle (this is technically called a ditch). An early example of this can be seen in the Battle of the Trench, a religious war, one of the early battles fought by Muhammad.
With the advent of accurate firearms, trenches were used to shelter troops. Trench warfare and t…
Archaeology
Trenches are used for searching and excavating ancient ruins or to dig into strata of sedimented material to get a sideways (layered) view of the deposits – with a hope of being able to place found objects or materials in a chronological order. The advantage of this method is that it destroys only a small part of the site (those areas where the trenches, often arranged in a grid pattern, are located). …
Safety
Trenches that are deeper than about 1.5 m present safety risks arising from their steep walls and confined space. These risks are similar those from pits or any steep-walled excavations. The risks include falling, injury from cave-in (wall collapse), inability to escape the trench, drowning and asphyxiation.
• Falling into the trench. Mitigation methods include barriers such as railings or fencing.
See also
• Abyssal plain
• Cut (earthmoving)
• Cut and fill
• Ditch
• Gully
External links
• Trenching and Excavation (a NIOSH Safety and Health Topic, Centers for Disease Control and Prevention)
• Trench Safety Awareness (a NIOSH Publication, Centers for Disease Control and Prevention)