Evaporation from oceans and other water bodies into the air and transpiration from land plants and animals to the air. Oxygen dihydride is another way of referring to water, but modern day usage often restricts the expression "hydride" to ionic compounds (which water isn't). From the nuclear electricity field, water https://kevalaniru.com/boost-your-childs-health-and-energy-with-boxed-aqua-kids-mineral-water/