Answer:
Defends your noggin from the hard pavement
It is something you make after you've weighed your options.
The lunch destination of choice for teenagers and hospital employees.
The more you have of me, the less you see. Who am I?
If you suffer from this, you might wear a wig
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.