What percentage of water on the earth is fresh?

How much water should  we  drink in a day?

Animals need:

 In villages, people collect water from:

Water shortage may lead to:

What  is meant by potable water?

The artificial supply of water to agricultural land is called:

What do we need for survival?

Which is the main source of fresh water on earth?

In towns and cities, water is purified in a: