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They are formed at destructive plate boundaries where one plates subducts under another. The deep sea trench marks the point at which the denser plate ( or faster plate when it is oceanic vs. oceanic) begins to subduct the lighter one. They are very long, narrow and steep-sided How_are_deep_sea_trenches_are_formedin the ocean floor.
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∙ 11y ago
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∙ 9y agoIn a World War I context, trenches were primarily made with hand-tools by infantrymen on either side of the conflict. Infrequently, natural ravines or terrain-dips, as well as craters resulting from cannon-fire or other causes, were made use of in the formation of a trench line.
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∙ 15y agoTo create a trench, the soldiers must go through the following steps; # Dig a rectangular hole in the ground, about three to four feet in width, stretching as long as needed in length. # Place duckboards (flat pieces of wood) along the bottom of the trench. This was done to try to keep the soldiers feet dry. # Place sandbags along the top of the trench (this was known as the parapet). # In the space between the trenches, places tangles and rolls of barbed wire to slow an enemy's advance toward your fortress. Many trenches were equipped with machine gun posts, and in some cases underground caves.
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∙ 10y agothey are formed when two oceanic plates collide.
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What are continental trenches?
coninental trenches are trenches that go across countries...i think
Why do food cans have ridges?
The ridges are for compressive strenght
Why do passive margins have no trenches?
Trenches are caused by plate movement.
What was a periscope used for in World War 1?
An early form of the periscope was used to see over the tops of the trenches.
What was the reserve trenches like?
Reserve trenches
What are 2 geological features that can occur at plate boundaries?
What are three geographic features that may be found at plate boundaries?
Are maps made from sonar and magnetometer data led to the discovery of ocean ridges and deep-sea trenches?
no they found ocean ridges sonar maps alone found deep-sea trenches
What are valleys between the ridges on the ocean floor?
They are called oceanic trenches.
How do ocean ridges and deep-sea trenches support the theory of sea floor spreading?
Sea Floor spreading has to do with the crust forming at ocean ridges and being destroyed at deep sea trenches.
How do you contrast mid-ocean ridges and trenches?
Mid-ocean ridges are the birthplace of oceanic crust. Trenches represent the destruction and burial of oceanic crust. They are at opposite ends of the Earth's convection currents that move through the asthenosphere.
Are divergent plate boundaries associated with folded mountains and deep sea trenches?
No. Sea floor trenches are found at convergent boundaries. divergen boundaries form mid-ocean ridges.
Is subduction occuring at ridges or trenches?
Subduction usually occurs in trenches, for example the Marriana's Trench or the Aleutian trench! Hope that Helps!
Where do ocean trenches occur?
At spreading centers.
What was discovered that led to the knowledge that tectonic plates exist?
Mid-ocean ridges and trenches
Does theory continental drift state that new ocean crust is formed at ocean ridges and destroyed at deep sea trenches?
No, the theory is that Seafloor spreading state that the new ocean crust is formed at ocean ridges and is destroyed at deep sea trenches.
How is the formation of mid ocean ridges and trenches different?
Stop trying to cheat on ur homework
How is the formation of mid-ocean ridges and trenches different?
Stop trying to cheat on ur homework
