because the sky is blue
Rayleigh Scattering ~ John Tyndall and others
Earth Fire Air Water
4 water , it s three states as gas ,liquidand solid >> click >>
www.atmo.arizona.edu/students/courselinks/fall16/atmo336s2/lectures/sec1/water.html
www.atmo.arizona.edu/students/courselinks/fall16/atmo336s2/lectures/sec1/water.html