Answer:
I am a path between high natural masses; remove the first letter to get a path between man-made masses.
I am the noblest musical instrument
I don't have eyes, but once I did see. Once I had thoughts, but now I'm white and empty. What am I?
I am a caribbean shape that makes ships disappear
I am known for my natural tuxedo and marching
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.