Water cycle for kids - The Sun heats up the water from oceans, lakes, and rivers, and water changes into water vapor by the process of evaporation. As the water vapor rises up into the air, it starts cooling down and forms tiny water droplets. These water droplets come together to form clouds. This process is called condensation When the clouds start getting heavy and cannot hold the water droplets anymore, they fall back to the earth in the form of rain. This process is called precipitation. Some of the water that falls on the earth seeps into the ground. This water is available to us in the form of groundwater. The remaining water falls back into oceans, lakes, rivers, and seas. This process is called a collection. The sun starts heating up this water once again. This circulation of water is called the water cycle.