What is the earth’s crust made of?

The earth’s crust is divided into continental and oceanic. The continental thickness is about 45 km on platforms, in the mountains it reaches 80 km and, in turn, is divided into three balls – a sedimentary sphere, “granite” and “basalt” (the latter two are separated by the Konrad surface). Oceanic crust is at the heart of ocean basins. With a thickness of more than 6 km. Unlike the mainland, it does not have a “granite” sphere. The Mokhorovichich surface acts as the boundary between the crust and the mantle.