which type of crust is generally the youngest? continental crust asthenospheric crust oceanic crust

Brief Explanations:

Oceanic crust is formed at mid - ocean ridges through volcanic activity. New oceanic crust is continuously created here, making it generally the youngest type of crust. Continental crust is much older as it has been around for a long time and is not formed in the same rapid, new - forming way as oceanic crust. The asthenosphere is not a type of crust; it is a layer in the upper mantle beneath the lithosphere (which includes crust).

Answer:

oceanic crust