<span>The hard mineral crust formed at or near the surface of soil is known as</span></h2></div>

A river/ lake with an inflow of domestic sewage rich in organic waste may result in</h2></div>

<span>The ozone hole over </span><span>Antarctica</span><span> was disco…

Main cause of extinction of species from tropical areas is<span><br> </span></h2></div>

Which of the following is major source of water pollution?</h2></div>

Man made sources of radiation pollution are:<span><br> </span></h2></div>

Which one of the following is mainly responsible for depletion of ozone layer?<br> </h2></div>

Explain the following.<br> (i) Salination <br> (ii) Ozone hole <br> (iii) Pollution<br> (iv) Sec…