What is van mahotsava? What is its social impact?</h2></div>

The substance that pollute the water are called _________.</h2></div>

Increasing skin cancer and high mutation rate are due to _________.<br> </h2></div>

Which materials are hard to remove from the polluted water?

For how long and at what temperature an experiment is run to determine the value of BOD of a water body? </h…

What is radioactive pollution? What are its effects?</h2></div>

In a greenhouse the glass panel lets the light in, but what is not escaped?

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