Question
Water in a river is cleaned naturally. Do you agree? Think and explain.
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Answer
Yes, river water is cleaned naturally by a process that is similar to wastewater treatment plant. As muddy water when flows through grass or weeds on its way to a stream, mud and solid particles get filtered out. At the bottom of a lake or stream, microorganism brings chemical changes in the water. The natural filtration process removes pollution from the roundwater throughout the process making it clean and fit for drinking.
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