Answer:
I am nothing but holes tied to holes, yet am strong as iron.
Take one out and scratch my head, I am now black but once was red.
The sun bakes them, the hand breaks them, the foot treads on them, and the mouth tastes them.
I crawl on the earth. And rise on a pillar.
I am what remains when nothing is left.What am I?
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?