21. The water pollution in river is measured by the dissolved amount of
22. Ultraviolet rays can be used in water treatment as
23. Tar roads get damaged if there is
24. Aerated water contains
25. The BOD values of water indicate the
26. Iron and manganese present as pollutants in water cannot be removed by________
27. Table salt gets moist during rainy season because
28. The unit to measure the flow of water is
29. When water itself combines chemically with some element or mineral it is called
30. Sea water is saltier than rain water because
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