Answer:
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I've told you all, I cannot tell you more. What am I?
You throw me out when you use me and take me in when you are done. What am I?
What can you catch but never throw?
I can be written, I can be spoken, I can be exposed, I can be broken. What am I?
I row quickly with four oars, but never come out from under my own roof. 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.