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Why is old oceanic crust denser than new oceanic crust?
cause its cooler
Earth does not get bigger as new oceanic crust forms?
Just as new oceanic crust forms at mid-ocean ridges, old oceanic crust is destroyed at subduction zones.
Where is old seafloor destroyed?
Oceanic crust isn't destroyed because it's old; it is, in fact, destroyed due to destructive plate boundaries. This is where a continental plate and an oceanic plate move towards each other. As the oceanic crust is denser, it is pushed under the continental plate. Here it is forced into the mantle of the earth, where it is destroyed due to heat and convection currents.
Why isn't new oceanic crust generated along volcanic island arcs?
At a volcanic island arc, an oceanic plate slides into the mantle and thus oceanic crust is destroyed. The volcanoes add material on to of the crust, but to not cause the crust to expand outward.
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.
Why doesn't our planet get larger from sea floor spreading?
As new oceanic crust forms at mid-ocean ridges, old oceanic crust is destroyed at subduction zones.
What happens to old oceanic crust as new molten material rises to the mantle?
The older oceanic crust moves away from the spreading center and is eventualy subducted back into the mantle.
What happens to the old oceanic crust as new molten material rises from the mantle?
The older oceanic crust moves away from the spreading center and is eventualy subducted back into the mantle.
In sea-floor spreading what happens to the old oceanic crust as new molten material rises from the mantle?
In sea-floor spreading, the old oceanic crust is pushed away from the mid-ocean ridge as new molten material rises from the mantle. As the new material solidifies, it forms new oceanic crust, leading to the spreading of the seafloor and the continuous creation of new crust. The older oceanic crust eventually gets subducted back into the mantle at tectonic plate boundaries.
Does the old oceanic plates sink into the mantle at mid-ocean ridges in a process called subduction?
No, old oceanic plates do not sink into the mantle at mid-ocean ridges; instead, mid-ocean ridges are the sites of seafloor spreading, where new oceanic crust is formed. Subduction occurs at convergent plate boundaries, where an older, denser oceanic plate sinks beneath a lighter continental plate or another oceanic plate into the mantle. This process helps recycle the oceanic crust and is responsible for the formation of features like deep ocean trenches.
Why is oceanic crust usually much younger than continental crust?
Crust is produced at constructive plate boundaries, usually at mid ocean ridges. Here the plates are moving apart and magma wells up to form new basaltic rock. This means the youngest crust is usually part of an oceanic plate. When an oceanic plate collides with a continental plate, the denser oceanic plate sinks down in a subduction zone and ends up as magma again. The less dense continental crust is forced upwards and is preserved. Continental rocks are thus often very old.
What does ocean crust mean in science?
The oceanic crust is the part of the earth's crust that is below the ocean. The rock that makes up the oceanic crust is about 200 million years old.
