Answer:
The more you take, the more you leave behind. What are they?
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.
It is something you will never see again.
I am the red tongue of the earth, that buries cities.
What goes up and down the stairs without moving?
As round as an apple. As deep as a cup. All the king's horses can't pull it up.