Under normal conditions, water exists as a:

1. solid
2. liquid
3. gas
4. all of the above

The most suitable source of water for domestic and industrial uses is :

1. sea water
2. river water
3. spring water
4. rain water

Name:

(a) Two major sources of natural water

(b) Two sources of surface water

(c) Two underground sources of water.

List three major impurities present in river water.