Which layer of the earth’s crust is the lowest?

The earth’s crust can be continental and oceanic, they have an excellent structure. The first consists of three layers: sedimentary (clay, sand), granite (granites and minerals similar in density) and basalt (basalts). Oceanic does not have a granite layer, therefore it consists of the remaining two. What they have in common is that they both end in a basalt layer. The deeper, the denser the components of these layers. Next comes the mantle, but it is not part of the crust, but in the place with the core and the earth’s crust is part of the Earth.