The term "water cycle" describes the transport and storage of water. The water changes the aggregate state, which means that no water is lost.
Water from seas, rivers, lakes evaporates and rises as water vapor into the atmosphere. The resulting humidity is transported from the wind to the mainland. When the humid air hits cold air layers, it slides over it and rises, just as it hits the mountain side or is warmed over warm ground. As the air rises, it cools down. However, cold air can absorb less water vapor than warmer ones, so the water vapor contained in the air condenses from a certain height. This creates clouds. If the water droplets are large enough, precipitation occurs, and the water falls back to earth in the form of rain, snow or hail. There the water collects and then flows over rivers and streams back into the sea.