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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).
For pipeline installation in trenches, there are five basic types of pipeline trenches. The five types are based on the construction of the embedment. The five types apply to both rigid and flexible pipe. However, the types do not relate to a specific type of pipe.
23 kwi 2023 · Oceanic trenches are long, narrow depressions or deep valleys that occur in the Earth’s oceanic crust. They are the deepest parts of the world’s oceans and are typically located in the areas where tectonic plates meet.
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 (24,000 to 36,000 feet). They typically form in locations where one tectonic plate subducts under another.
Trenches are deep, elongated depressions in the ocean floor, often formed at convergent plate boundaries where one tectonic plate is subducted beneath another. They play a crucial role in the dynamics of plate tectonics, influencing both geological processes and the distribution of seismic activity.
When two oceanic plates meet: The heavier of the two oceanic plates subduct, forming deep ocean trenches and island arcs. Island arcs are a series of volcanic islands, formed in an arc shape, e.g. the Caribbean. Submarine volcanic eruptions, lead to crust building up and rising above sea level.
The convergence of two oceanic plates creates two distinctive landforms: Deep sea trenches form due to subduction. An example of a deep-sea trench at an oceanic–oceanic boundary is the Mariana Trench. Island arcs may form where submarine volcanic eruptions lead to crust building up and rising above sea level.
