What is the process of removal of topsoil by the action of wind and water called?

Have you ever observed any water pollution in your area? What measures would you suggest to control it?

The smog which acts as an oxidizing agent is .....

$A$ factory was started near a village. Soon,the villagers began experiencing the presence of undesirable gases in the atmosphere,leading to symptoms like headaches,chest pain,colds,dry throats,and breathing difficulties. The villagers blamed the smoke emitted from the factory chimney for these problems. Describe what might have happened and provide the chemical equations to support your explanation.

What is the troposphere,and which components are present in it?

Which among the following statements is $NOT$ a principle of green chemistry?