Answer:
Looks like water, but it's heat. Sits on sand, lays on concrete. A play on the eyes, but it's all lies.
What can you put in a barrel to make it lighter?
What zips through the sky with a tail of fire and dust. It could be an omen, its origin to discuss?
What turns from red to black as soon as it touches water?
Fatherless and motherless. Born without sin, roared when it came into the world. And never spoke again.
You use it between your head and your toes, the more it works the thinner it grows.