Question

how water pollution is caused

Answer 1

exertion of wasre materials by industries into water bodies and cleaning animals in water releasing bones of died ones in water

Answer 2

The water pollution may be caused by different different sources like sewage matters, nuclear reactors, agricultural wastage, industrial wastage, domestic wastage and hot water of thermal plant etc.

Extra Info:-

1. Domestic sewage primarily Contains biodegradable organic matter.

2. Water having DO content below 8.0 mgL^-¹ may be considered as contaninated and below 4.0 mgL^-¹ heavily polluted.

3. DO is measured by oximeter.