When air cools, the water in it condenses around dust or other particles in the air, called condensation nuclei. These small droplets then become visible as clouds. As more and more droplets join together they become too heavy and fall from the cloud as rain.
Clouds form from water or ice that has evaporated from Earth’s surface, or from plants that give off water and oxygen as a product of photosynthesis. When it evaporates—that is, rises from Earth’s surface into the atmosphere—water is in the form of a gas, water vapor. Water vapor turns into clouds when it cools and condenses—that is, turns back into liquid water or ice. In order to condense, the water vapor must have a solid to glom onto. This solid “seed” may be a speck of dust or pollen, or a drop of water or crystal of ice. Dew is water vapor that has condensed back onto Earth’s surface—on grass or a car’s windshield, for example. Rain is when
Clouds will often absorb smoke to create rain, commonly referred to as "nature's laundry" due to this process.
Some places have frequent rain. This makes