Every living thing on earth depends on the water cycle. People depend on the water cycle for the food and water they need. People don't know where it really starts. So, we started when the water evaporates. Heat from the sun makes the water change into a gas called water vapor.
Warm air rises, so the water vapor is carried with it.
When the water vapor gets cooled down, it turns into a cloud. When the cloud gets heavy with moisture, it might rain, snow or hail. Some of it goes into ground water and some of it goes into rivers, lakes or oceans. And then it starts all over again when some of the water evaporates. That is how it works.