Dirty water containing harmful substances is an example of…, Filtration, Contamination, What is a reservoir?, A place where water is stored, A type of pollution, 'We need to reduce waste', said the engineer., The engineer said that they need to reduce waste, The engineer said that they needed to reduce waste., 'Use a filtration system to ensure the water is clean and safe', He recommended to use a filtration system., He recommended using a filtration system., 'We should recycle the waste', said the scientist., The scientist suggested recycling the waste., The sccientist suggested to recycle the waste

Environmental engineering

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