Originally Posted by Spotch
Actually its the rising hot air which creates the reflective surface that looks like water.
actually... theres a lot more to it than just that,
An optical phenomenon that creates the illusion of water, often with inverted reflections of distant objects, and results from distortion of light by alternate layers of hot and cool air. Also called fata morgana.
so, you got half of it right, but theres the "distortion" of light from different layers...
this is all news to me as well.