#slide.descent  (geology) the descent of a large mass of earth or rocks or snow etc.
  supertype:  #descent.change_of_location  a movement downward
  subtype:  #avalanche.slide  a slide of large masses of snow and ice and mud down a mountain
     subtype:  #lahar  an avalanche volcanic water and mud down the slopes of a volcano
  subtype:  #landslip__landslide  a slide of a large mass of dirt and rock down a mountain or cliff
     subtype:  #mudslide  a landslide of mud
     subtype:  #rockslide  a landslide of rocks

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