Water cycle
en.wikipedia.org
Water cycle
Each year, the global water cycle delivers 110,000 cubic kilometers of water over land in the form of rain, sleet, and snow. (These values are approximate; various models have produced different estimates.) About 64 percent of that precipitation returns to the atmosphere through evaporation or transpiration (the use of water by plants, crops, grass
... See moreEven real clouds in the sky are part of a hydrological cycle. Everything physical comes from somewhere, everything goes somewhere, everything keeps moving.
“Water is versatile. It can be big and powerful, it can quench thirst, it can be healing, it can drown us. It finds its own level, always. That is, water is always seeking balance and has a place it has to go. It can be scarce, it is necessary. We’re utterly, devastatingly dependent on it. It’s beautiful and tragic and it feeds us sometimes. When w
... See moreglobe. A planetary boundary for freshwater resources needs to secure water flows to regenerate precipitation, support terrestrial ecosystem functioning and services (such as carbon sequestration, biomass growth, food production, and biological diversity), and also ensure the availability of water for aquatic ecosystems.