They both get drawn into a hole along with a swift stream of water and gently flow downwards, sometimes fast, sometimes slow, through holes and cracks and passages of all kinds, deeper and deeper into the ground.

Chhutki : (Pointing at the walls of the tunnel through which they are floating.)
Baadshah , look! The colour of the earth in these tunnels and passages keeps changing as we go deeper.

Baadshah : Yes, Chhutki. The Earth is made up of many layers of rocks, soil and other materials in all sizes from large rocks to fine dust. These act as a wonderful filter made by Nature.

Chhutki : Filter?

Baadshah : Yes. Rain water from the surface of the earth passes through the soil, just as we are doing now. As it passes through, all the dirt and impure particles are trapped by the layers of the soil,allowing only pure, clean water to pass down the underground layers to where it collects. And, we are about to reach that place any moment now. Hang on!