Can ground water get polluted by sewage? How?

Can air, water and soil be exhausted by human activities ?

Can water be made to boil without heating?

A cricketer can throw a ball to a maximum,horizontal distance of 100 m. How much high above the ground can the cricketer throw the same ball?

Can any source of energy be pollution - free? Why or why not?

How is the clearning ability of water improved by detergent?