Difine-Scarcity of water.

About 71% of earth's surface is covered with water,then why do we face scarcity of water?

What are the reasons for scarcity of water?

What are the reasons for scarcity of water?

Boiling water is changing into steam.Under this condition the specific heat of water is ……………. .

Now-a-days, water scarcity is becoming a prime problem. To compensate the need, various strategies are being carried out by the Governments at national and international levels. One such effective technology is Desalination of sea water. Which principle is followed in their technology. Define it.

The refractive index of water is 1.33. What will be the speed of light in water?