It is a process where water at the surface turns into water vapor. Water absorbs heat energy from the sun and turns into vapor.
As water precipitates, some of it is absorbed by the soil. This water enters into the process of transpiration. Transpiration is a process similar to evaporation where liquid water is turned into water vapor by the plants. The roots of the plants absorb the water and push it toward leaves where it is used for photosynthesis. The extra water is moved out of leaves through stomata as water vapor
Apart from evaporation, sublimation also contributes to water vapor in the air. Sublimation is a process where ice directly converts into water vapor without converting it into liquid first.
As water vaporizes, it rises into the atmosphere. These particles form clouds and fogs.
The clouds then pour down as precipitation due to wind or temperature change.
As the water pours down (in whatever form), it leads to runoff. Runoff is the process where water runs over the surface of earth. When the snow melts into water it also leads to runoff