Continental crust does not normally sink into the mantle because continental crust is of lower density than mantle material as compared to oceanic crust that is high in iron and nickel.

Question

Quizplus · Accepted Answer

Continental crust is typically composed of less dense materials such as granite and has a thickness ranging from 20 to 70 km, whereas oceanic crust is primarily basaltic rock, which is denser than granite, and has a thickness of around 7 km. Therefore, continental crust is less dense than mantle material and does not sink into the mantle.

Continental Crust Does Not Normally Sink into the Mantle Because