Answer:
Iām white; perfect for cutting & grinding. For most animals I am a useful tool.
Better touch me before you proceed to second. What am I?
Open me, and you can't see me without a mirror. Close me and you can't see me at all. What am I?
I can go through glass without breaking it. What am I?
The more you add the less it weighs. What is it?
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.