rain
Rain is a natural precipitation phenomenon. The water vapor in the atmosphere condensed into small water droplets, a large number of small water droplets formed a cloud. When the water in the clouds to reach a certain quality will fall to the surface, this is the rain. Rain is an indispensable part of the Earth's water cycle, the source of water for most ecosystems, and is the only way for almost all of the terrestrial plants to supply fresh water away from the river. The raindrops are also likely to evaporate when they have not yet reached the ground. In some cases, when the rain passes through the forest, the rain is often shuttled by the forest and evaporated directly into the atmosphere. This can reduce the erosion of the surface. In some hot areas of the surface (such as the desert) direct evaporation of water is particularly common. This kind of rain is called the streamer. In the airborne weather report, the code for the rains is RA. ...