Answer:
What asks but never answers?
It is worldwide, but once only a spider could weave one
I am the third from a sparkle bright, I thrive throughout the day and night. Deep in the path of a cows white drink. I've had thousands of millions of years to think. But one of my creatures is killing me. And so the question I ask to thee, is
What is the smallest sentence with all letters in the English alphabets?
Just head and foot yet never tires of dancing.
You use it between your head and your toes, the more it works the thinner it grows.