crack
failure in a material
gap site
vacant space in a row of buildings, formed by a building that was either destroyed or planned but not built
fracture
geologic discontinuity feature, often a diaclase, or a fault
fissure
groove, natural division, deep furrow, elongated cleft, or tear in various parts of the body
fracture
phenomenon by which materials or structures are split apart under the action of mechanical stress
winkle-hawk
square-shaped tear in fabric