Answer:
Turns me on my backs and open up my stomach. You will be the wisest of men though at start a lummox.
I begin and have no end. Eventually, I will be the ending of all that has begun. What am I?
When you take away the whole from me there is always some left.
I can go through glass without breaking it.
Four fingers and a thumb, yet flesh and blood I have none. What am I?
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.