The cave has me, the wind hasn't
The stories, the pirates, the demons, the lands...all nothing if it isn't me
The masterworks of science revolve 'bout me
You'll all be blind if it ain't me
The rock has me, the sun hasn't
I fear only one
The one that doesn't let me go.
Tell me - who am I?
Edit: It seemed as if "all nothing if it isn't me" was a standalone line, so I merged it in the second line
Edit 2 (These edit was made after four answers - apologies for this)
Since the answers are almost the right answer, so I'll add a couple of more lines describing it.
You won't be here if you haven't me
I am the Poseidon, the Apollo and have half your food
I am in the black not in the white
I am in a chopper not in a plane
The literature worships me, for it be horrible if it ain't me.