You may say "kiretsu."
Another word for crevice is crack.
A crevice is a narrow crack or opening, a fissure or cleft.
It is a crevice
black crack
It is a crevice
Incorrect. A crevice could be a crack or a hiding place (gap in the drywall or something), but it is not a keyhole.
Crevice, fissure
it is crack,cleft, crevice, fissure, chap
A crevice is smaller than a cave. I would go with "black crack."
black crack
Crevasse not to be confused with crevice
black crack