There's a distinct difference between the words crevice and crevasse: the former refers to a small cut in rock, and the latter is about a deep cleft in a glacier or ice sheet. Both words, despite their differences, may be traced back to the Old French word crevace, which meant "gap" of any kind. This comes from the verb crever, meaning "to break" or "burst". This derives from Latin crepare, meaning "to crack". The connections to chasms are clear. Crepare may be reconstructed to to Proto-Indo-European korh, an onomatopoeic noise that is imitative of natural creaking sounds. In that vein, korh eventually also gave way to the Proto-Germanic khrabanaz (with the same meaning), which spawned Old English hræfn, which meant "bird" (because the creaking of birds is similar to that of crevices, apparently). A few centuries of development, and we are left with the word raven. An interesting etymological connection, to be sure, but a welcome one.
Adam Aleksic, a leading contender for valedictorian of his high school, is a 215-month-old boy with disturbing interests in etymology, vexillology, geography, and law. Adam would like to one day visit Tajikistan and probably isn't spying for the Uzbek government.
The Etymology Nerd