Question

what is crust ???.........​

Answer 1

The crust is a hard layer that forms on the outside of something, like a loaf of bread. ... Crust is also a verb meaning “to form a hard outer layer.” Crusting happens with more than just food, like when a layer of dirt crusts your clothes after a romp in the mud.

Answer 2

it is the outermost solid shell of Rocky planet, dwarf planet or naturall satullite.