is nature water always pure?

Dear Student,

Please find below the solution to the asked query:

Natural water means water in lakes, river and oceans is not pure as it is contaminated with naturally occurring substances, animal waste, chemicals or pesticides and it is saline also (like ocean water).  

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it is but not always as sometimes a part of river cuts off from rest of the river and becomes stagnant

Hope it helped !!!
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it depends as it is with impurities or not
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