subduction is the answer.
subduction
i think that its subduction ...
In a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep ocean trenches.
Subduction.
Subduction.
your answer is subduction
The process where the ocean floor sinks beneath the crust and back into the mantle is known as subduction. This is the result of the collision of two tectonic plates. This in turn results in the formation of fold mountains and volcanism (such as that which occurs in the Western US - for example Mt. St. Helens and the Western coast of South America).
The process in which the ocean floor sinks into the mantle is called subduction. This occurs at convergent plate boundaries, where one tectonic plate slides beneath another. Subduction zones are associated with deep-sea trenches and volcanic activity.
The old ocean floor typically sinks toward the mantle at a rate of about 2 to 5 centimeters per year. This process occurs at subduction zones, where tectonic plates converge, and the denser, older oceanic crust is forced beneath lighter continental crust or younger oceanic crust. The sinking of the ocean floor contributes to the recycling of Earth's materials and plays a crucial role in plate tectonics.
Because the oldest parts reach the continental crust and then the ocean floor sinks beneath the continental crust, into the mantle.
it is right in your book soo... you should be able to answer this
True. Magnetic stripes on the ocean floor are created by alternating bands of magnetic polarities in the oceanic crust. These stripes are evidence of seafloor spreading where new crust is formed at mid-ocean ridges, pushing older crust away. Subduction zones are where older crust sinks back into the mantle.