<b>How is 'bad' ozone different from 'good' ozone?</b></h2></div>

The main factor responsible for the depletion of ozone layer is addition of _____in the atmosphere.</h2></div&g…

The excess fertilizers not consumed by crops are washed away from land by rain and pollute _____.<br> </h2>&…

<span>The total percent of land in the world under forest area is</span><br> </h2></div>

When domestic sewage mixes with river water, __________<br> </h2></div>

Thermal pollution causes a decrease in dissolved oxygen.</h2></div>

PUC certificate stands for</h2></div>

_____ shields the surface of the earth from ultraviolet (UV) radiation from the sun.</h2></div>