Trenches are associated with subduction zones and commonly occur in the Pacific Basin.
Which of the following is characteristics of oceanic oceanic convergent plate boundaries?
The features of an ocean-ocean subduction zone are the same as those of an ocean-continent subduction zone, except that the volcanic arc will be a set of islands known as an island arc. The older plate subducts into a trench, resulting in earthquakes. Melting of mantle material creates volcanoes at the subduction zone.
Where in the ocean does oceanic lithosphere sink into the mantle?
Subduction zones are where the cold oceanic lithosphere sinks back into the mantle and is recycled. They are found at convergent plate boundaries, where the oceanic lithosphere of one plate converges with the less dense lithosphere of another plate.
Which type of plate boundary is characterized by arcs of Stratovolcanoes and deep ocean trenches?
Convergent plate boundaries in the strict plate tectonics sense occur only at the deep-sea trenches and related ‘subduction zones.
Where are deep oceanic trenches most abundant?
Ocean trenches are found in every ocean basin on the planet, although the deepest ocean trenches ring the Pacific as part of the so-called “Ring of Fire” that also includes active volcanoes and earthquake zones. Ocean trenches are a result of tectonic activity, which describes the movement of the Earth’s lithosphere.
What process is evident at oceanic trenches?
What process is evident at oceanic trenches? Sinking of oceanic lithosphere into the mantle at a subduction zone.
What is a oceanic oceanic 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 is oceanic to oceanic convergence?
In ocean-ocean convergence, two oceanic plates converge or collide. The denser plate subducts into the asthenosphere below the convergence zone and forms a trench at the surface. This region below the convergence zone is called the zone of subduction.
What happens when oceanic and oceanic plates collide?
Ocean-Ocean Collisions
When two oceanic plates collide one oceanic plate is eventually subducted under the other. Where one plate slides under the other is referred to as the ‘subduction zone’. As the subducting plate descends into the mantle where it is being gradually heated a benioff zone is formed.
Why does oceanic lithosphere sinks beneath continental lithosphere at convergent boundaries?
In collisions between two oceanic plates, the cooler, denser oceanic lithosphere sinks beneath the warmer, less dense oceanic lithosphere. As the slab sinks deeper into the mantle, it releases water from dehydration of hydrous minerals in the oceanic crust.
When continental type lithosphere collides with oceanic type lithosphere the oceanic type lithosphere is most likely to Subduct?
The oceanic lithosphere would subduct because it has a higher density at 3.0 grams per cubic centimeter. **Oceanic lithosphere, which is basaltic, has a higher density than continental lithosphere. Why are volcanic chains associated with convergent boundaries?
What is oceanic lithosphere and continental lithosphere?
Oceanic lithosphere is typically about 50-100 km thick (but beneath the mid-ocean ridges is no thicker than the crust). The continental lithosphere is thicker (about 150 km). It consists of about 50 km of crust and 100 km or more of the uppermost mantle.
What causes the volcanoes and deep valleys of East Africa?
What causes the volcanoes and deep valleys of East Africa? They are young, active volcanoes built on a continental margin above a sinking slab of oceanic lithosphere.
Which convection model suggests that cold oceanic lithosphere sinks to great depths almost to the Earth’s core?
3. Plate-mantle convection by the whole-mantle convection model involves cold oceanic lithosphere being subducted and sinking to great depths in the mantle and mixing throughout the entire mantle. This model provides hot material from the core-mantle boundary in plumes upward to the lithosphere and the surface.
What type of boundary occurs along the Aleutian Islands in the North Pacific?
The Aleutian Trench (or Aleutian Trough) is an oceanic trench along a convergent plate boundary which runs along the southern coastline of Alaska and the Aleutian islands.
How many oceanic trenches are found in the Indian Ocean?
These troughs extend to great depths, and in the Indian Ocean, there are two particularly deep trenches: the Java Trench and the Diamantina Trench.
Where are trenches located?
Trenches are found on the floor of the sea; however, their common name is deep ocean trenches because they are more often found in the deepest areas of the ocean. Trenches are formed in subduction zones where tectonic plates collide.
What process is evident at oceanic trenches?
What process is evident at oceanic trenches? Sinking of oceanic lithosphere into the mantle at a subduction zone.
What evidence did the Deep Sea Drilling Project find about the dates of rocks in the ocean basins?
What evidence did the Deep Sea Drilling Project find about the dates of rocks in the ocean basins? The ocean basins are relatively young; most ocean basin rocks and sediments are Cretaceous or younger in age. Which of the following was never proposed as evidence supporting the existence of Pangaea?
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