LessonsImpurity in Stagnant and Running Water, Large Ponds, and Aquatic CreaturesQuiz

The effect of impurity in flowing water is identified through changes attributable to it in colour, taste or smell.

A contaminant’s falling into flowing water and a lasting effect upon the water are different conditions. Water whose characteristics remain affected by impurity is not treated as unaffected running water.

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What Counts as an Observable Effect?

Impurity in Stagnant and Running Water, Large Ponds, and Aquatic Creatures

The effect of impurity in flowing water is identified through changes attributable to it in colour, taste or smell.

A contaminant’s falling into flowing water and a lasting effect upon the water are different conditions. Water whose characteristics remain affected by impurity is not treated as unaffected running water.