A ________ Marks The Site Where Old Oceanic Lithosphere Begins Its Descent Into A Subduction Zone.?
When oceanic lithosphere collides with another plate?
When two oceanic lithospheres collide one runs over the other which causes the latter to sink into the mantle along a zone called a subduction zone. The subducting lithosphere is bent downward to form a very deep depression in the ocean floor called a trench. The deepest ocean in the world is found along trenches.
Which one of the following is part of the continental margin?
The continental margins consist of three portions: (1) the continental shelf which has shallow water depths rarely deeper than 650 ft) and extends seaward from the shoreline to distances ranging from 12.3 miles to 249 miles (2) the continental slope where the bottom drops off to depths of up to 3.1 miles and (3) the …
What is the abyssal plain quizlet?
Abyssal plains are deep extremely flat features of the ocean floor. They are formed as sediments from coastal regions are transported far out to sea and settle to the ocean floor and as materials from the water column above settle to the bottom.
What is the origin of most abyssal plain sediments?
What happens when two lithosphere collides?
When two lithospheric continental plates collide the rocks at the boundary breaks and folds and thereby gets lifted up to form mountains and mountain…
What happens to the old oceanic lithosphere at the convergent plate boundary?
As oceanic lithosphere cools it becomes denser and the further away from the plate boundary it moves the thicker it becomes. At a convergent plate boundary the oceanic lithosphere sinks beneath the adjacent plate in a process known as ‘subduction’.
What continental margins occur where oceanic lithosphere?
continental margins occur where oceanic lithosphere is being subducted beneath the edge of a continent. List two sources for the salts in seawater. Chemical weathering of rock on the continents Earth’s interior. A(n) __________ is the vast deep flat sediment-covered portion of the deep-ocean basin.
Where are active continental margins located?
An active continental margin is found on the leading edge of the continent where it is crashing into an oceanic plate. An excellent example is the west coast of South America. Active margins are commonly the sites of tectonic activity: earthquakes volcanoes mountain building and the formation of new igneous rock.
Where is the continental margin?
Where are abyssal plains most common quizlet?
Where are abyssal plains most common? What are abyssal plains and how are they formed? Flat areas of the ocean floor situated between ocean trenches and continental rises. Found between 3000 – 6000m .
What type of sediment are abyssal plains composed of quizlet?
Abyssal plains are the flattest features on Earth. Ophiolitic sediment is composed of wind-blown dust and microscopic skeletons that settle slowly to the sea floor. Why are scientists so interested in the organisms living next to black smokers?
What is abyssal plain what kind of sediment is found there?
Abyssal plains are flat areas of the ocean floor in a water depth between 3 500 and 5 000 with a gradient well below 0.1°. They occupy around 28 % of the global seafloor. The thickness of the sediment cover seldom exceeds 1 000 m and the sediments consist of fine-grained erosional detritus and biogenic particles.
Where are abyssal hills found?
The greatest abundance of abyssal hills occurs on the floor of the Pacific Ocean. These Pacific Ocean hills are typically 50–300 m in height with a width of 2–5 km and a length of 10–20 km.
How are abyssal hills formed?
Tectonic plates are formed and move apart at mid-ocean ridges. Some portion of this plate-separation process can occur by stretching of the crust resulting in a complex pattern of extensional faults. Abyssal hills the most ubiquitous topographic features on Earth1 are thought to be a product of this faulting2 3.
What is the abyssal plain located?
The term ‘abyssal plain’ refers to a flat region of the ocean floor usually at the base of a continental rise where slope is less than 1:1000. It represents the deepest and flat part of the ocean floor lying between 4000 and 6500 m deep in the U.S. Atlantic Margin.
When continental lithosphere collides with oceanic lithosphere the oceanic plate will be subducted Why?
when oceanic lithosphere collides with continental lithosphere oceanic subducts because it’s denser than continental lithosphere. when two plates are made of oceanic lithosphere and collide one plate is subducted under the other forming deep ocean trench.
What happens when oceanic plates collide?
What happens when an oceanic plate meets another oceanic plate?
When two oceanic plates converge the denser plate will end up sinking below the less dense plate leading to the formation of an oceanic subduction zone. … Old dense crust tends to be subducted back into the earth. An example of a subduction zone formed from a convergent boundary is the Chile-Peru trench.
What happens to the old lithosphere?
What happens to the old continental lithosphere at the convergent plate boundary? It is pushed underneath the surface. It may change but stays at the surface.
What is oceanic oceanic convergent boundary?
An ocean-ocean convergent boundary occurs location where two oceanic plates come together and the denser plate sinks or subducts beneath the less dense plate forming a deep ocean trench. Chains of volcanoes called island arcs form over subduction zone melting occurs where the subducting plate reenters the mantle.
How are oceanic oceanic and oceanic continental convergent boundaries different?
The oceanic plate is pushed under the continental plate and melted. … Continental plates are much thicker that Oceanic plates. At the convergent boundaries the continental plates are pushed upward and gain thickness. The rocks and geological layers are much older on continental plates than in the oceanic plates.
Where is new oceanic lithosphere formed?
Where does new oceanic lithosphere form?
midocean ridges
Seafloor Processes Oceanic lithosphere forms at midocean ridges where hot magma upwells and then cools to form plates as the material moves away from the spreading center.
What develop where oceanic lithosphere bends downward and sinks into the mantle?
| Question | Answer |
|---|---|
| The presence of which one of the following would indicate that the land had been uplifted or that sea level had fallen? | elevated marine terrace |
| ________ develop where oceanic lithosphere bends downward and sinks into the mantle. | Deep ocean trenches |
What occurs at active ocean margins?
Active margins are marked by earthquakes volcanoes and mountain belts. Unlike passive margins they lack a continental rise and abyssal plain. Instead the continental slope ends in an oceanic trench and beyond the trench the topography is hilly and irregular often dotted with rugged volcanic seamounts.
Why are most oceanic trenches found in the Pacific Ocean?
Why are most oceanic trenches found in the Pacific Ocean? The Pacific Ocean is shrinking and plates are descending below surrounding plates along its edges hence the creation of trenches.
What are subduction zones?
What marks the true division between continents and oceans?
Continental crust is less dense than oceanic crust. What marks the true division between continents and oceans? … The average ocean depth is greater than the average elevation of continents.
Which is the oceanic crust?
What is the division of the ocean floor where the ocean and continents merge?
the division of the ocean floor where continents and oceans merge is known as the. continental margin. the early history of marine science is closely associated with.
Where is the most biologically rich part of the ocean?
continental shelf
The continental shelf is the shallowest part of the continental margin. Although they only make up 8% of the Earth’s ocean surface area they are the most biologically rich part of the ocean containing the majority of the sea life.
What is new lithosphere produced in association with?
The production of new seafloor and oceanic lithosphere results from mantle upwelling in response to plate separation. The melt rises as magma at the linear weakness between the separating plates and emerges as lava creating new oceanic crust and lithosphere upon cooling.
Which seafloor feature is an example of an abyssal plain?
After scaling the mid-ocean ridge and traversing hundreds to thousands of miles of abyssal plains you might encounter an ocean trench. The Mariana Trench for example is the deepest place in the ocean at 36 201 feet.
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