What percentage of the earth's surface is covered with water? 

Which of the following is not an effect of acute scarcity of water on plants? 

Dried sludge is used as

World water day is on 

Which natural process continuously converts some of the saline sea water into freshwater? 

Inorganic impurities present in waste water

The water bearing layer of the earth is called 

The falling of water from the clouds as rain or snow is called 

Bacteria in water cause the disease.

Roots respire through