Answer:
He's small but he can climb a tower.
It is in every mountain, it's not in any hill, it's not in all the world, and yet it's in the mill.
It's tough as nails, Or soft as snow. People use it for their rink, Some just put in their drink.
What has a hundred limbs, sometimes leaves, but cannot walk?
What do you have in December that you don't have in any other month?
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.