#descent.change_of_location  a movement downward
  supertype:  #change_of_location__travel  a movement through space that changes the location of something
  subtype:  #drop.descent__fall  a free and rapid descent by the force of gravity; "it was a miracle that he survived the drop from that height"
     subtype:  #free_fall  the ideal falling motion of something subject only to a gravitational field
     subtype:  #plunge  a steep drop
  subtype:  #lightening  descent of the uterus into the pelvic cavity that occurs late in pregnancy; the fetus is said to have dropped
  subtype:  #set.descent  the descent of a heavenly body below the horizon; "before the set of sun"
  subtype:  #shower.descent  a sudden downpour (as of tears or sparks etc) likened to a rain shower; "a little shower of rose petals"
  subtype:  #sinking  a descent as through liquid (especially through water); "they still talk about the sinking of the Titanic"
     subtype:  #settling__subsiding__subsidence  a gradual sinking to a lower level
     subtype:  #submergence__submerging__submersion__immersion  covering completely with water
        subtype:  #dip.submergence  a brief immersion
     subtype:  #foundering__going_under__goingunder  (of a ship) sinking
  subtype:  #slide.descent  (geology) the descent of a large mass of earth or rocks or snow etc.
     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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