Describe in simple terms the changes that occur when water is heated or cooled

Where does rain come from? Hopefully the answer will be from the sky or clouds. But how does the water get there and where does it come from?

Two thirds of the Earth’s surface is covered by water, if we include the oceans, seas, rivers and lochs or lakes. As water evaporates from the heat of the day the air becomes filled with water vapour. This warm, humid air rises. As it rises, it chills. The water vapour turns back to its liquid state. The word for this process is condensing. We see this as either mist, low down, or clouds, higher up. If the clouds become over-saturated, it rains. This is a simplified explanation of part of the Water Cycle. An idea of how this operates can be gleaned from the graphic. Click the following link for further information on water and the water cycle .

Water and .......... -->

Explain the water cycle using the particulate model