Earth's water does not sit still. It moves in a big loop called the water cycle. The sun warms oceans, lakes, and puddles. Some water turns into invisible vapour and rises into the air. Later it cools, forms clouds, and falls again as rain or snow. That water fills rivers, lakes, and seas, then the loop can start again. The same water has been reused for a very long time.
⚡ DID YOU KNOW?
Water is not used up forever when it rains. It keeps changing form and moving around Earth.