Evaporation from oceans as well as other water bodies to the air and transpiration from land plants and animals into your air. Oxygen dihydride is yet another way of referring to water, but present day usage normally restricts the phrase "hydride" to ionic compounds (which water is not). "[240] Guanzi https://kevalaniru.com/water-in-gabletop-cartons-versus-water-in-pet-bottles-in-a-life-cycle-assessment-face-off/