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Sigma KEE - NaturalMagnet
KB Term: 
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NaturalMagnet
Any Substance from nature that exhibits Magnetism.
Relationships      
Parents Magnet Any object that emits Magnetism. Note that this includes both NaturalMagnets and Electromagnets and therefore the most specific superclass is Object, since natural magnets are divisible Substances and electromagnets are CorpuscularObjects.
  天然物质 Any Substance that is not the result of an IntentionalProcess, i.e. any substance that occurs naturally.


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