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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
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What causes oceanic trenches?
Deep ocean trenches are made where one plate is submerged under another
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.
Deep ocean trenches are evidence for?
Deep ocean trenches are evidence for plate tectonics, showing where one tectonic plate is subducting beneath another. These trenches form at convergent boundaries when the denser oceanic plate sinks into the mantle. The presence of deep ocean trenches also indicates areas of seismic activity and potentially tsunamis.
When oceanic plates come together what land form does this event create?
When oceanic plates come together, they create a subduction zone where one plate is forced beneath the other. This process forms deep ocean trenches and can lead to the formation of volcanic arcs and islands.
Convergence can occur between what types of plates?
Convergence can occur between oceanic-oceanic, oceanic-continental, and continental-continental plates. This process typically leads to the formation of mountain ranges, deep ocean trenches, and volcanic arcs.
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
Why would deep trenches be found in or around the plate boundaries?
Deep trenches are typically found in or around plate boundaries due to the process of subduction, where one tectonic plate is forced beneath another. This occurs primarily at convergent boundaries, where an oceanic plate collides with a continental plate or another oceanic plate. The descending plate creates a deep trench in the ocean floor, as it is pushed into the mantle. These trenches are often associated with intense geological activity, including earthquakes and volcanic eruptions.
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.
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 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.
What geologic feature is often found at the subducted oceanic plates?
At subducted oceanic plates, deep ocean trenches are commonly formed. These trenches mark the location where one tectonic plate is being forced under another, creating a zone of intense geological activity. Additionally, volcanic arcs often develop parallel to these trenches as magma generated by the subduction process rises to the surface.
