Answer:
a.continental, oceanic
Explanation:
The earth's crust is one of the three main layers of the earth and it makes up almost the entire solid composition of the planet, that is, the portion of the earth where the rocks are. Below it is the cloak, which is basically magma.
In terms of location, the earth's crust can be divided into two parts: the oceanic crust and the continental crust. The ocean is the thinnest, with a depth ranging from 5 to 10 kilometers, while the continental is thicker, ranging from 30 to 70 kilometers.