Rain is needed as a source of fresh water, which is essential for the survival of humans, plants and animals. Rain fills aquifers, lakes and rivers, maintaining the lives of living organisms. Rain maintains natural features, such as forests.
The process of evaporation exhausts fresh water sources, necessitating rain to replace the lost water. Rain is essential because it removes the need for transporting water inland and desalination activities. The flow of minerals within the soil, and from the land to the sea, is mediated by rain. Rain is needed to sustain agricultural processes, such as farming and cattle grazing.