Here's a diagram of the way that water moves around our environment - it's called the water cycle.
Spend a moment looking over it and thinking about what's going on.
Water is essential for life and, whether we like it or not, rain brings water for plants, animals and people. Water which falls as rain runs into streams and rivers on its way to the sea.
The wind, and heat from the sun evaporates water from lakes and the sea. It rises into the air to form clouds, where the water vapour condenses into droplets.
The clouds are blown over the land, and when the water droplets in the cloud become too heavy, they fall as rain, sleet or snow.
OK with all that? Let's tackle a few questions to help you get the water cycle nailed.