'Crevice' comes from Latin 'crepare' (to crack) — the same root behind 'crevasse' in glaciers.
From Old French 'crevace' (a crack, a fissure, a split — modern French 'crevasse'), derived from Vulgar Latin *crepācia, formed from Latin 'crepāre' (to crack, to burst, to creak, to rattle), of uncertain ultimate etymology, possibly onomatopoeic or from PIE *krep- (to crack, to make a noise). Latin 'crepāre' generated a remarkable cluster of English derivatives through semantic splitting: 'crevasse' (a deep fissure in a glacier, borrowed later directly from French), 'decrepit' (thoroughly cracked or broken with age, from 'dēcrepitus'), 'discrepancy' (a cracking apart of agreement, from 'discrepāre,' to sound differently), 'crêpe' (a thin, crinkled fabric or pancake), and 'crepitate' (to crackle). The diminutive suffix '-ice' (via Old French '-asse' reduced