Answer:
Pregnant every time you see her, yet she never will give birth.
When I'm born I fly. When I'm alive I lay. When I'm dead I run.
To cross the water I'm the way, for water I'm above. I touch it not and, truth to say, I neither swim nor move.
I fly, yet I have no wings. I cry, yet I have no eyes. Darkness follows me. Lower light I never see.
What always runs but never walks, often murmurs, never talks, has a bed but never sleeps, has a mouth but never eats?
What never gets any wetter no matter how hard it rains?