Longest river in the world is:

Largest fresh water lake in India is:

The dirty water look :

India's longest lake is:

What is the taste of sea water?

Which are strong walls built across a river to hold back the flow of water?

During summer, the level of water in a river is:

A small machine which is used to clean water in home:

Which activity makes the river water dirty?

Things which don't dissolve in water will stay: