Answer:
I am a ship that can be made to ride the greatest waves. I am not built by objects, but built by minds. What am I?
I am heavy forward, but backward I'm not. What am I?
I am a kind of coat that can only be put on when wet. What am I?
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
Glittering points that downward thrust. Sparkling spears that never rust.
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.