CRUST

'Crust' may refer to:

★ Crust (geology), the outer solid layer of a planet

★ Crust punk, a hardcore punk / heavy metal fusion

★ Crust (band), a psychedelic Texas band

★ Crust (bread), the outer solid portion of a baked substance
'Crust' may also refer to:

★ In forest fires, crust is something that covers trees to slow the fire
Crust is also a term for the dry, flakey sustance on a unsanitary persons elbows