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Usually when it meets another tectonic plate at a convergent plate boundary. If the oceanic plate converges with a continental plate the denser oceanic plate will be forced under the continental plate.
If it converges with another oceanic plate the older (and therefore cooler and denser) plate will be forced under the younger plate.
What else can I help you with?
Why does the oceanic crust sit lower in the mantle than the continental crust?
Oceanic crust is denser than continental crust due to its composition and age, causing it to sink lower into the mantle. The oceanic crust is also thinner and has been subjected to more intense heat and pressure, which contributes to its lower position in the mantle compared to the thicker, lighter continental crust.
Why would a certain thickness of continental crust displace less of the mantle than the same thickness of oceanic crust?
Continental crust is less dense than oceanic crust, so it floats higher on the mantle. This means that the same thickness of continental crust will displace less mantle compared to oceanic crust. Additionally, continental crust is composed of lighter rocks like granites, while oceanic crust is made of denser rocks like basalt.
Why does the continental crust float higher on the mantle than on the oceanic crust?
Continental crust is less dense and thicker than oceanic crust, causing it to float higher on the mantle. The continental crust is also compositionally different, with a greater amount of less dense materials like granite compared to the basaltic composition of oceanic crust. This difference in density and composition results in the continental crust floating higher on the mantle.
What are two parts in lithospheric plates?
i believe it is the crust and upper mantle...
Is it true that At deep-ocean trenches conduction allows oceanic crust to sink back into the mantle?
Yes, it is true. Deep-ocean trenches are locations where one tectonic plate is subducted beneath another. Conduction helps transfer the heat from the sinking oceanic crust back into the mantle, contributing to the overall process of plate tectonics and the recycling of Earth's crust.
What is oceanic-oceanic subduction?
Oceanic crust sinking under a plate with continental crust
What is the oceanic lithosphere?
The lithosphere is composed of crust and hard upper mantle. The oceanic lithosphere would be hard upper mantle and basaltic oceanic crust.
What is oceanic lithosphere?
The lithosphere is composed of crust and hard upper mantle. The oceanic lithosphere would be hard upper mantle and basaltic oceanic crust.
What kind of crust usually goes into the mantle?
Oceanic crust gets subducted into the mantle.
Does the continental or the oceanic crust extend farther into the mantle?
The continental crust because it is thicker than the oceanic crust
What happens to mantle rock descending oceanic crust scrapes past continental crust?
As the oceanic crust descends beneath the continental crust, the mantle rock is subjected to high pressure and temperature. This causes the mantle rock to partially melt, producing magma that can rise to the surface and form volcanoes. The interaction of the descending oceanic crust with the continental crust can also lead to earthquake activity.
Why does the oceanic crust sit lower in the mantle than the continental crust?
Oceanic crust is denser than continental crust due to its composition and age, causing it to sink lower into the mantle. The oceanic crust is also thinner and has been subjected to more intense heat and pressure, which contributes to its lower position in the mantle compared to the thicker, lighter continental crust.
What forces drive the process in subduction zones dense pieces of oceanic crust are pulled downward toward the mantle?
The main driving force in subduction zones is the gravitational pull on the dense oceanic crust as it subducts beneath less dense continental crust or another oceanic plate. This process is further facilitated by the negative buoyancy of the cold, dense oceanic lithosphere compared to the underlying mantle. Additionally, the sinking of the oceanic crust is also driven by the forces exerted by the movement of the tectonic plates at the surface.
Explain why continental crust can displace more of the mantle than oceanic crust can?
Continental crust is generally thicker and less dense than oceanic crust, allowing it to displace more of the mantle beneath it. The buoyancy of continental crust enables it to float higher on the mantle compared to the denser oceanic crust, which sinks deeper into the mantle. Additionally, the composition of continental crust, which includes lighter materials like granite, contributes to its ability to displace a larger volume of mantle. This difference in density and thickness results in continental crust having a greater gravitational pull on the mantle compared to oceanic crust.
Why would a thickness of continental crust displace less mantle than the same thickness of oceanic crust?
Continental crust is generally thicker and less dense than oceanic crust, which is denser and thinner. When continental crust is added or displaced, it exerts less force on the underlying mantle due to its buoyancy, resulting in less mantle displacement. In contrast, the denser oceanic crust displaces more mantle when submerged or altered, leading to a greater effect on the mantle beneath it. This difference in density and buoyancy explains why the same thickness of continental crust displaces less mantle than oceanic crust.
What happens to old oceanic crust as molten materials rises from the mantle?
The older oceanic crust moves away from the spreading center and is eventualy subducted back into the mantle.
What happens to old oceanic crust as new molten material from the mantle?
The older oceanic crust moves away from the spreading center and is eventualy subducted back into the mantle.
