hydrogen X oxygen X hydrogen

The water cycle is the continuous circulation of water, changing between liquid, solid, and gas phases. All driven by radiant energy emitted by the sun (solar radiation).
At room temperature, it is a nearly colorless, tasteless, and an odorless liquid. But in large volume, may appear blue. Theres is a dynamic equilibrium between the liquid and vapor states. And can also withstand at different temperatures and pressures. Water is the most abundant molecule on Earth's surface, composing 70-75% of the planet.
Water is unfortunately becoming more and more scarce. And my hypothesis is that the next world war can very well be over water not oil. Thus giving "the man" reason to steal water from Interstellar clouds of another galaxy.