Multiple Choice Questions<br> BOD is a measure of<br> </h2></div>

Describe how ozone layer is formed?</h2></div>

The pollutant that causes hole in the ozone layer is<span><br> </span></h2></div>

"Burning of fossil fuels results in global warming". Give reasons to justify this statement.</h2&g…

Which one of the following is a greenhouse gas?</h2></div>

Ozone hole over Antarctica appear during</h2></div>

Name two international efforts to check ozone depletion</h2></div>

World climate is threatened by increase in the concentration of</h2></div>