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Why are Oceanic trenches found only in association with subduction zones?
Wiki User
∙ 12y ago
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.
Wiki User
∙ 12y ago
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Where are deep oceanic trenches found?
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
Subduction zones are found near what kind of boundaries?
Convergent plate boundaries, usually oceanic plate to continental plate.
Are major crustal features like earthquakes volcanoes mountains and trenches found randomly on earths surface or is there a pattern?
There is a pattern. Mountains, volcanoes, and earthquakes are found predominantly near plate boundaries. Trenches are found expluxively at subduction zones.
What causes an oceanic trench to form?
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 depressions in the ocean floor.
Where can Igenous rocks be found?
Anywhere you find volcanic activities but usally is on plate boundaries where you find subduction of one plate into another. Usually Continent-Oceanic convergence. the oceanic sink below the continent because the continental plates are less denser than the oceanic plate. you can also find igneous rocks on oceanic-oceanic plates where the form island arc.
Where can trenches be found?
Subduction zones
At What type of boundary would a trench be created?
Trenches such as the Peru-Chile trench are found at destructive (also known as convergent) subductive plate margins where the denser oceanic plate is being subducted beneath the lighter continental plate. Trenches are common at subduction zones.
Where are deep oceanic trenches found?
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
Subduction zones are found near what kind of boundaries?
Convergent plate boundaries, usually oceanic plate to continental plate.
What type of landforms or activity can be found at a convergent boundary?
You could find mountains, valleys, faults, subduction zones, trenches, or experience volcanism or earthquakes.
Why are most oceanic trenches found in the pacific ocean?
The Pacific Ocean is part of the Ring of Fire. The ring of fire is underwater trenches made my moving plates. The plates pushed on each other and eventually moved downward, creating trenches
Are major crustal features like earthquakes volcanoes mountains and trenches found randomly on earths surface or is there a pattern?
There is a pattern. Mountains, volcanoes, and earthquakes are found predominantly near plate boundaries. Trenches are found expluxively at subduction zones.
Why is the oldest rock on planet earth found on continental plates not oceanic plates?
Oceanic crust is constantly being recycled. New oceanic crust is formed at mid ocean ridges while old ocean crust is destroyed at subduction zones. As a result there is little oceanic crust that is older than 200 million years. Continental crust does not get destroyed by subduction, so much of it has been around since the Precambrian time.
Description of oceanic-oceanic subduction?
Occurs when ocean crust sinks under continental crust, it sinks because it's colder and denser,at these sites, deep-ocean trenches also form along with coastal mountains. As the oceanic crust moves, these trenches often causes underwater earthquake, as the crust sinks under a continent, the crust buckles to form a range of mountains, like island arcs, parallel to a deep-ocean trench. Some of the mountains are volcanoes, which form as melted oceaninc crust rises through the top plate. For example: Cascade Mountains in Oregon and Washington.
What features of the ocean floor is the deepest?
The ocean basins are the result of tectonic forces and processes. All of the ocean basins were formed from volcanic rock that was released from fissures located at the mid-oceanic ridges. The oldest rocks found in these basins are approximately 200 million years old. This is a lot younger than the oldest continental rocks which have ages greater than 4 billion years. The reason for this discrepancy is simple. Tectonic processes destroy old oceanic rocks! Oceanic rock is returned to the Earth's mantlewhen oceanic crust is subducted. Many of these subduction zones occur at the continental marginswhere oceanic crust meets continental crust. Subduction also creates the ocean's deep trenches.
Where can subduction volcanos be found?
the subduction volcano is found where
What plate boundary is a composite volcano on?
Composite volcanoes most often are found near subduction zones. They can be found at either oceanic-oceanic convergent plate boundaries, oceanic-continental plate boundaries, or continental-continental plate boundaries. They are especially prevalent in the Pacific Ring of Fire. A few composite volcanoes, however, have been found at divergent boundaries and away from plate boundaries at hot spots.
