The part of the lithosphere which forms the ocean floor is

The part of the lithosphere which forms the ocean floor is called "sima." The lithosphere is the outermost layer of the Earth, which includes the crust and the uppermost part of the mantle. The crust can be divided into two parts: sial and sima. Sial refers to the continental crust, which is primarily composed of lighter, less dense rocks such as granite. Sima, on the other hand, refers to the oceanic crust, which is primarily composed of heavier, more dense rocks such as basalt. The ocean floor is made up of sima, which is formed by volcanic activity at mid-ocean ridges. As magma rises to the surface, it cools and solidifies to form new oceanic crust. Over time, the ocean floor spreads out as new crust is formed at the ridges and older crust is pushed away from the ridge and subducted back into the mantle at deep-sea trenches. In summary, the part of the lithosphere which forms the ocean floor is sima, which is the part of the crust primarily composed of heavier, more dense rocks such as basalt.