Water pollution occurs when harmful substances like chemicals and microorganisms contaminate the river, lake, stream and ocean degrading water quality and making water toxic for human consumption and environment. Mostly it is due to human activities. This poses a great threat to aquatic ecosystem. Title: General Chemistry Lecture 437 - WATER POLLUTION (SUBSTANCES OF WATER CONTAMINATION) Instructor: Prof. I. Z. Khan Subscribe: Facebook:
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Water pollution occurs when harmful substances like chemicals and microorganisms contaminate the river, lake, stream and ocean degrading water quality and making water toxic for human consumption and environment. Mostly it is due to human activities. This poses a great threat to aquatic ecosystem. 
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