Water covers 70% of the earth's surface and is vital to all living things. Water is always circulating between the earth's surface and the atmosphere in the water cycle.

Heat from the sun makes water evaporate from the oceans, rivers and lakes forming water vapor.

As the water vapor rises it cools and starts to condense and become water again. This forms clouds.

As the clouds get cooler the water droplets become bigger and bigger. Eventually they fall as rain, snow, sleet, or hail.

The water then runs back into the oceans, rivers and lakes and the cycle repeats!