subduction
subduction is the answer.
i think that its subduction ...
subduction
Subduction .
Why do scientists look to the ocean floor to research the mantle? Because magma from the mantle flows out of active volcanoes on the ocean floor. These underwater volcanoes have given scientists many clues about the composition of the mantle.
The ocean floor sinks into the mantle primarily due to the process of subduction, where one tectonic plate is forced beneath another into the Earth's mantle. This usually occurs at convergent plate boundaries, where an oceanic plate collides with a continental plate or another oceanic plate. The denser oceanic crust is pushed down, creating trenches and leading to geological phenomena such as earthquakes and volcanic activity. This recycling process is a key component of the Earth’s lithospheric dynamics and plate tectonics.
New rock is added to the ocean floor through a process called seafloor spreading, where magma rises from the Earth's mantle at mid-ocean ridges, cools and solidifies to form new oceanic crust. This process helps expand the ocean floor and contributes to the movement of tectonic plates.
In a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep ocean trenches.
Why do scientists look to the ocean floor to research the mantle? Because magma from the mantle flows out of active volcanoes on the ocean floor. These underwater volcanoes have given scientists many clues about the composition of the mantle.
We look at the ocean floor to study the mantle because the ocean floor is made from rocks that were once part of the mantle but have be changed. These changes can be undone to a certain degree, and can allow us to study at the very least the major changes of the shallow mantle.
Seafloor spreading occurs at mid-ocean ridges, where tectonic plates pull apart, allowing magma to rise and create new oceanic crust. As this process continues, older crust is pushed away from the ridge and can eventually be subducted back into the mantle at ocean trenches. This continuous cycle of creation and recycling leads to a dynamic and constantly renewing ocean floor, influencing geological activity and marine ecosystems. Consequently, the ocean floor is not static but rather a constantly evolving landscape.
Crust mantle core