Answer:
I fill a room but take no space.
By Moon or by Sun, I shall be found. Yet, if there's no light around, I am undone. What am I?
I am very easy to get into,but it is hard to get out of me. What am I?
What has 3 feet but no toes?
What has a bottom at the top?
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.