Answer:
I fill a room but take no space.
I am round. I have only one line. Circle is not my name indeed. What am I?
You turn me over after you have travelled far.
What type of house weighs the least?
I know a word of letters three. Add two and fewer there will be. What is the word?
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.