Answer:
I pass before the sun, but make no shadow.
I can be quick and then I'm deadly, I am a rock, shell and bone medley. If I was made into a man, I'd make people dream, I gather in my millions By ocean, sea and stream.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.
Looks like water, but it's heat. Sits on sand, lays on concrete. A play on the eyes, but it's all lies.
I am the red tongue of the earth, that buries cities.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?