answersLogoWhite

0

Trenches occur at convergent boundaries when one tectonic plate which is more dense, is pushed beneath another tectonic plate that is less dense. This process is called subduction.

Usually where divergent boundaries in the earth's crust are. When faults move apart, they create trenches.<-- no divergent boundaries in the ocean create mountain ridges not trenches

http://upload.wikimedia.org/wikipedia/en/a/a4/SubZone.jpg

User Avatar

Wiki User

13y ago

What else can I help you with?

Related Questions

Deep-oceanic trenches are most abundant around the rim of the?

Deep-oceanic trenches are most abundant around the rim of the Pacific. Deep ocean trenches are surficial evidence for sinking of oceanic lithosphere into the mantle at a subduction zone.


Oceanic crust returns to the mantle at deep ocean trenches which are?

rocks


When two oceanic plates collide it creates?

when two oceanic plates collide they create a deep-ocean trench, at deep-ocean trenches subduction occurs.


At deep-ocean trenches what allows oceanic crust to sink back into the mantle?

Subduction.


What is the process where oceanic crust is sinking under continents at deep ocean trenches?

Sinkation


Are oceanic plates only made up of oceanic crust?

yes but oceanic crust is younger than continental crust because of deep sea trenches


What causes oceanic trenches?

Deep ocean trenches are made where one plate is submerged under another


Are the oldest rocks of the oceanic crust found in deep ocean trenches far away from active mid-ocean ridges?

No, the oldest rocks of the oceanic crust are typically found near the continents where they have had more time to form and accrete. Deep ocean trenches are usually associated with subduction zones where tectonic plates are being forced underneath each other, rather than locations where new oceanic crust is forming.


What is the land forms produced underwater caused by the movement of oceanic plate?

Submarine landforms created by the movement of oceanic plates include ocean ridges, deep-sea trenches, seamounts, and underwater volcanoes. These features are a result of tectonic processes such as seafloor spreading, subduction, and volcanic activity.


Why are Oceanic trenches found only in association with subduction zones?

The trenches are evidence that one of the colliding plates is moving beneath the other. As the two plates move together, one gets pushed below the other. The place where this sinking/bucking occurs creates a deep trench. The deepest of which is Marianas trench about 7 miles deep.


What forms when continental crust converge with oceanic crust?

Deep sea trenches, Mountain ranges, Volcanoes, and Earthquakes.


Deep sea trenches are found?

the galopagos islands