Question

A clean river was found to become polluted after crossing a city. Explain why

Answer 1

because people in that city will put their garbage inside the river due to this the river may polluted.and also by the over use of fertiliser in the field when we irrigate the field the fertiliser will mix with water and became pollutes.
and also by the industries pour their waste directly into the river by these the river may polluted.

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Answer 2

the reason are

• the city industrial wasted water is thrown in the clean river
• the river can be near some factory and industrial area.
• today human beings don't think what they are doing to the environment.they just throw garbage in a river without thinking