Where does all the water come from?
Water on earth is continuously recycled. The energy from the sun causes water from the land, rivers and sea to evaporate. This means it changes from a liquid to a gas. It rises up and condenses to form clouds as the air gets colder. When clouds get very heavy water droplets fall out of them as rain and snow. This is called precipitation. Water then flows through rivers and soil back to the sea and the cycle starts again.