Which  one of the following is not a reason for shortage of usable water?</h2></div>

The release of <span class="katex"><span class="katex-html" aria-hidden="true…

Polonium-<span class="katex"><span class="katex-html" aria-hidden="true"><s…

BOD level in fresh water should not exceed beyond</h2></div>

Size of particulate matter ranges from ___.<span><br> </span></h2></div>

The term greenhouse effect was given by<span><br> </span></h2></div>

Destruction of ozone can cause </h2></div>

Chlorine free radical reacts with 'ozone' to form _______.<span><br> </span></h2></div>