#natural_spring__naturalspring__spring__fountain__outflow__outpouring  a natural flow of ground water
  supertype:  #geological_formation__geology  the geological features of the earth
  instance:  #Fountain_of_Youth
  subtype:  #geyser  a spring that discharges hot water and steam
     subtype:  #Old_Faithful  a geyser in Yellowstone National Park that erupts for about 4 minutes about every 65 minutes
  subtype:  #hot_spring__hotspring__thermal_spring__thermalspring  a natural spring of water at a temperature of 70 F or above

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