How are electronic items dangerous?</h2></div>

List at least three gaseous air pollutants that are emitted from automobiles and industries.</h2></div>

<span>Name any two water pollutants which are toxic for plants and animals.</span></h2></div>

Planting of trees on barren land is called </h2></div>

The maximum hole of ozone is found over ______</h2></div>

During secondary treatment of primary effluent, how does significant decrease in BOD occur?</h2></div>

A strong radiation inversion is more likely to occur on a:<span><br> </span></h2></div>

What is the cause of depletion of Ozone layer?</h2></div>