crust

nouns

the outer layer of the Earth
Earth's crust, crust
a hard outer layer that covers something
crust, encrustation, incrustation
is derived from
crusty
the trait of being rude and impertinent; inclined to take liberties
cheekiness, crust, freshness, gall, impertinence, impudence, insolence
is derived from
crusty

verbs

form a crust or form into a crust
"The bread crusted in the oven"
crust
entails
become dry or drier
"The laundry dries in the sun"
dry, dry out
is a type of (narrower)
undergo or cause to undergo a change in the surface
change surface