What plate boundary is the deep sea trenches on?
convergent plate boundaries
In particular, ocean trenches are a feature of convergent plate boundaries, where two or more tectonic plates meet. At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench.
What happens to tectonic plates at deep sea trenches?
Trenches are formed by subduction, a geophysical process in which two or more of Earth’s tectonic plates converge and the older, denser plate is pushed beneath the lighter plate and deep into the mantle, causing the seafloor and outermost crust (the lithosphere) to bend and form a steep, V-shaped depression.
Where do deep ocean trenches occur?
Ocean trenches are the deepest parts of the ocean, with the Mariana Trench near Guam having the deepest spot on Earth, the Challenger Deep. The deepest point of the Challenger Deep is 36,070 feet below the ocean surface, so it’s over 7,000 feet deeper than Everest is tall. Most ocean trenches are in the Pacific.
What do deep-sea trenches reveal about Earth’s crust?
What do deep-sea trenches reveal about Earth’s crust? They indicate where crust is moving together and diving down deeper into the mantle.
What are deep ocean trenches associated with?
Deep-sea trenches generally lie seaward of and parallel to adjacent island arcs or mountain ranges of the continental margins. They are closely associated with and found in subduction zones—that is, locations where a lithospheric plate bearing oceanic crust slides down into the upper mantle under the force of gravity.
Is the Mariana Trench a convergent boundary?
In the case of a convergent boundary between two oceanic plates, one is usually subducted under the other, and in the process a trench is formed. “The Marianas Trench (paralleling the Mariana Islands), for example, marks where the fast-moving Pacific Plate converges against the slower moving Philippine Plate.
What type of plate boundary is the Mariana Islands?
convergent plate boundary
The Mariana Islands are located on a convergent plate boundary, where two plates are moving toward each other; this motion can be accommodated by a process called subduction, where one plate is bent downward and slides beneath the over-riding plate.
What is an example of a deep ocean trench?
They include the Philippine Trench, Tonga Trench, the South Sandwich Trench, the Eurasian Basin and Malloy Deep, the Diamantina Trench, the Puerto Rican Trench, and the Mariana.
Where are deep ocean trenches found?
the Pacific Ocean
There are about 50,000 kilometers (31,000 mi) of oceanic trenches worldwide, mostly around the Pacific Ocean, but also in the eastern Indian Ocean and a few other locations. The greatest ocean depth measured is in the Challenger Deep of the Mariana Trench, at a depth of 11,034 m (36,201 ft) below sea level.
What do deep sea trenches reveal about Earth’s crust?
Is Mariana Trench an evidence of oceanic oceanic convergent margin?
The Mariana trench contains the deepest part of the world’s oceans, and runs along an oceanic-oceanic convergent boundary. It is the result of the oceanic Pacific plate subducting beneath the oceanic Mariana plate.
Is the Mariana Trench a fault line?
2.2 Faulting and the Water Cycle at the Mariana Subduction Zone. Mariana outer rise bathymetry exhibits distinct faults, located closer than 100 km distance from the trench, with an onset at approximately the 6000 m bathymetric depth contour [Oakley et al., 2008; Gardner, 2010].
Is the Mariana Trench divergent or convergent?
Oceanic-oceanic convergence The Marianas Trench (paralleling the Mariana Islands), for example, marks where the fast-moving Pacific Plate converges against the slower moving Philippine Plate.
What type of convergent boundary is the Mariana Trench?
Oceanic/Oceanic Convergent Boundaries An example of an oceanic/oceanic convergent boundary is that between the Pacific and Mariana plates, which includes the Mariana Islands arc and a subduction zone encompassing the Mariana Trench, the deepest part of the World Ocean.
What is a deep ocean trench simple definition?
Oceanic trenches are prominent long, narrow topographic depressions of the ocean floor. They are typically 50 to 100 kilometers (30 to 60 mi) wide and 3 to 4 km (1.9 to 2.5 mi) below the level of the surrounding oceanic floor, but can be thousands of kilometers in length.
Where are deep-sea trenches found?
What is ocean ocean convergent boundary?
At an ocean-ocean convergent boundary, one of the plates (oceanic crust and lithospheric mantle) is pushed, or subducted, under the other (Figure 4.6. 1). Often it is the older and colder plate that is denser and subducts beneath the younger and warmer plate.
What are two common features found at convergent ocean ocean plate boundaries?
If two tectonic plates collide, they form a convergent plate boundary. Usually, one of the converging plates will move beneath the other, a process known as subduction. Deep trenches are features often formed where tectonic plates are being subducted and earthquakes are common at subduction zones as well.
What type of convergent plate boundary causes ocean trenches?
Some of the most familiar ocean trenches are the result of this type of convergent plate boundary. The Peru-Chile Trench off the west coast of South America is formed by the oceanic crust of the Nazca plate subducting beneath the continental crust of the South American plate.
What happens at an oceanic-oceanic convergent boundary?
At an ocean-ocean convergent boundary, one of the plates (oceanic crust and lithospheric mantle) is pushed, or , under the other (Figure 4.6.1). Often it is the older and colder plate that is denser and subducts beneath the younger and warmer plate.
What type of plate boundary is the Mariana Trench?
The Mariana Trench, in the South Pacific Ocean, is formed as the mighty Pacific plate subducts beneath the smaller, less-dense Philippine plate. In a subduction zone, some of the moltenmaterial—the former seafloor—can rise through volcanoes located near the trench.
What is a deep sea trench?
Written By: Deep-sea trench, also called oceanic 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.