The purest form of natural water is:

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

When the water vapour changes into tiny droplets of water near the ground, it is called:

1. mist
2. dew
3. fog
4. frost

Water is a:

1. compound
2. element
3. mixture
4. none of the above

Which of the following is a source of underground water?

1. Rivers
2. Lakes
3. Ponds
4. Springs