Answer:
Die without me, never thank me. Walk right through me, never feel me. What am I?
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
What has many keys but can't open a single lock?
The more holes you cover the lower I go.
Although a human shape I wear Mother I never had; And though no sense nor life I share in finest silks I'm clad. By every miss I'm valued much beloved and highly prized; still my cruel fate is such by boys I am often despised.
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.