The water cycle is also known as the hydrological system. The water cycle is important because it gives water to living organisms which need water to live. First, the water cycle starts by evaporating the water. This is called evaporation. The sun gives of energy and heat so that the water from a lake, ocean and any other body of water can be evaporated. Without the sun, there would be no evaporation leading to no water cycle. The water is evaporated and turns into water vapour since the air is so warm. As the water vapour gets higher in altitude it reaches the next main part of the water cycle, condensation. The air high up in the sky is cold changing the water vapour back into a liquid. The molecules in the water vapour start to clog up and stick with other molecules to create clouds. After this come precipitation. The clouds in the sky are full of water vapour molecules. Once the cloud gets heavy enough, and gravity starts working, it will start raining. Rain can come in snow, hail and sleet. The rain falls down to earth and waters the plants and help organisms grow. After that, the water will be evaporated and the water cycle will start all over again.