Answer:
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
I have no weight but I could destroy a mansion. What am I?
I am a chair that can move. What am I?
Everyone has me, but nobody can lose me. What am I?
Goes over all the hills and hollows, Bites hard, but never swallows.
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.