What Are Clouds Made Of?
4. Snow
When conditions are right, the water from clouds will fall as snow instead. Individual snowflakes are created when molecules of water freeze in the atmosphere and they gradually grow larger as more water molecules join them. The crystallization causes different patterns and the pattern on every flake is unique. These ice crystals will eventually become heavy enough to be pulled to the ground by gravity.
Their shape and density, however, means that they float down more slowly than rain does. When conditions are right, the snowflakes will begin to accumulate on the ground and this can cause havoc in some places that are not prepared for it.
