#feedback.natural_process  the process in which part of the output of a system is returned to its input in order to regulate its further output
  supertype:  #natural_process__naturalproces__natural_action__naturalaction__action__activity  a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity"
  subtype:  #negative_feedback  feedback in opposite phase with (decreasing) the input
  subtype:  #positive_feedback  feedback in phase with (augmenting) the input
     subtype:  #vicious_cycle__viciouscycle__vicious_circle__viciouscircle  one trouble leads to another that aggravates the first

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