Water evaporates from the Earth's surface and also from plants through photosynthesis. It goes up to the atmosphere and meets with the air mass. Due to atmospheric movements, the water vapor condenses. The condensation transforms it into droplets of water and create cloud. When these droplets become too heavy in the clouds, that is to say when the vaporization process reaches saturation, they fall on the ground in the form of rain. Photo credit: Valentin Pacaut / The Explorers