Answer:
Not my sister nor my brother but still the child of my mother and father. Who am I?
What runs around the whole yard without moving?
What occurs once in a minute, twice in a moment and never in one thousand years?
You use it between your head and your toes, the more it works the thinner it grows. What is it?
Temporary evidence of where you've been strolling
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.