_______ are absent in areas with water scarcity. 

Which one is an example for water borne disease?

Fresh water flows freely on some areas of the earth crust is called as ________________ .

Name the fungi which is used to treat polluted areas where there is high levels of nitrogen compounds ?

Pick the odd one out ?

Study of physical, chemical and biological aspects of fresh water is called

Which is the chief component of natural gas ?

Stagnant water is seen in

How much percentage of world population inhabit India?

Which type of water is used for flushing toilets after recycling ?