Write a short note on radioactive waste.<br> </h2></div>

A lake receiving nutrients would be</h2></div>

For drinking purpose, water should be tested for _______________.<br> </h2></div>

Write a short note on air pollution and its prevention.</h2></div>

Why is the concentration of ozone less over the north and south poles?</h2></div>

How is burning of fossil fuels thought to be related  to global warming?</h2></div>

Chlorofluorocarbons cause<br> </h2></div>

Increased level of carbon dioxide in the atmosphere traps the heat rays reflected by <span>the earth caus…