What is trench science definition?
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 is a trench in plate tectonics?
In particular, ocean trenches are a feature of convergent plate boundaries, where two or more tectonic plates meet. At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench.
What is an example of trench in science?
Deepest oceanic trenches
| Trench | Ocean | Lowest Point |
|---|---|---|
| Mariana Trench | Pacific Ocean | Challenger Deep |
| Tonga Trench | Pacific Ocean | Horizon Deep |
| Philippine Trench | Pacific Ocean | Emden Deep |
| Kuril–Kamchatka Trench | Pacific Ocean |
What does deep sea trench mean in science?
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 is called 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. 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 the dictionary definition of trench?
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.
How do trenches and ridges form?
Trench: very deep, elongated cavity bordering a continent or an island arc; it forms when one tectonic plate slides beneath another. Ridge: underwater mountain range that criss-crosses the oceans and is formed by rising magma in a zone where two plates are moving apart.
What is trench method?
The trench method consists of an excavated trench into which the solid wastes are spread, compacted and covered. The trench method is best suited for nearly level land where the water table is not near the surface. Usually the soil excavated from the trench is used for cover material.
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 the definition for trench quizlet?
A block of barbed wire and wooden obstacles to stop any enemy soldier from advancing through the trench system. Trench Block. A break in the barbed wire to allow soldiers out into no man’s land.
What does trenches mean in ww1?
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.
Which is the best definition of a trench?
Fortification. 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.
Where are the trenches in the Pacific Ocean?
Where are trenches located? Trenches are long, narrow and very deep and, while most are in the Pacific Ocean, can be found around the world. 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,
Where are the trenches in the subduction zone?
Subduction zone trenches. 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. There are 20 major trenches on Earth and 17 of these trenches can be found around the Pacific Ocean Basin.
How long did soldiers spend in the trenches?
As an example – and the numbers varied widely – a man might expect in a year to spend some 70 days in the front line, with another 30 in nearby support trenches. A further 120 might be spent in reserve. Only 70 days might be spent at rest. The amount of leave varied, with perhaps two weeks being granted during the year.
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