Theaverage family of four uses _____________ liters of water in one year.

To stay healthy, we need clean and safe water.

Used water is called __________________.

______________ is a lake build to store water.

Sewage contains lots of harmful germs and poisonous substances.

In a few countries, freshwater is obtained from seawater.

Water taken from a river or reservoir is __________.

_____________is a slow moving river of ice.

We use ___________ for drinking, cooking and watering the plants.

Only about ____per cent of water is freshwater that we can use.

Much of the salty water is in the form of ice.

Huge sheets of ice are called ______________.