cracks
krak
noun
a line on the surface of something along which it has split without breaking apart.
a hairline crack down the middle of the glass
split,fissure,crevice,break,fracture,rupture,breach,rift,cleft,slit,chink,gap,cranny,interstice,crazing
verb
break or cause to break without a complete separation of the parts.
the ice all over the bog had cracked
split,fracture,fissure,rupture,break,snap,cleave,craze