#scissure__crack__cleft__crevice__fissure  a long narrow opening
  supertype:  #opening.space__gap  an open or empty space in or between things; "there was a small opening between the trees"; "the explosion made a gap in the wall"
  subtype:  #chap.scissure  a crack in a lip caused usually by cold
  subtype:  #chink  a narrow opening as e.g. between planks in a wall
  subtype:  #crevasse  a deep fissure
  subtype:  #fatigue_crack__fatiguecrack  a crack in metal resulting from metal fatigue
  subtype:  #geological_fault__fault__shift__fracture__break  (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other; "they built it right over a geological fault"
     subtype:  #Denali_Fault  a major open geological fault in Alaska
     subtype:  #inclined_fault  a geological fault in which one side is above the other
        subtype:  #normal_fault__gravity_fault__common_fault  an inclined fault in which the hanging wall appears to have slipped downward relative to the footwall
        subtype:  #thrust_fault__overthrust_fault__reverse_fault__reversefault  a geological fault in which the upper side appears to have been pushed upward by compression
     subtype:  #strike-slip_fault  a geological fault in which one of the adjacent surfaces appears to have moved horizontally
     instance:  #San_Andreas_Fault
  subtype:  #rift.scissure  a narrow fissure in rock
  subtype:  #slit.scissure  a narrow fissure
  subtype:  #split.scissure  a lengthwise crack in wood; "he inserted the wedge into a split in the log"
  subtype:  #vent.scissure__volcano  a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt
  subtype:  #volcanic_crater__crater  a bowl-shaped opening at the top of a volcano
     subtype:  #caldera  a large crater caused by the violent explosion of a volcano that collapses into a depression
     subtype:  #maar  a flat-bottomed volcanic crater that was formed by an explosion; often filled with water

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