What kind of problem is a solid waste?<span><br> </span></h2></div>

<span>Metal generally present in polluted air is</span></h2></div>

Continuous sewage flow into a stream would lead to</h2></div>

Which of the following does not affect ozone layer ?</h2></div>

Biochemical Oxygen Demand (BOD) in a river water</h2></div>

How are the wild animals affected by cutting of forest?</h2></div>

Why does survival of fish and other aquatic animals become difficult during summer?</h2></div>

Mention how e-waste is produced and disposed off. Write the solution for its treatment.</h2></div>