Oil refineries, paper factories, textile and sugar mills, chemical factories are responsible for water pollution. These …

What is algal bloom?</h2></div>

Size of particulate matter ranges from ___.<span><br> </span></h2></div>

What happens when water is deoxygenated due to algal growth?

What are earth heating gases?</h2></div>

Biochemical oxygen demand in a river water </h2></div>

Ozone depletion is occurring widely in ______________.</h2></div>

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