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As they grow the crystals become snowflakes, which are heavy enough to fall from the cloud.
If the snowflakes pass through warmer air as they fall, they will begin to melt, turning to either sleet or rain.
Snowflakes that fall through moist air that is slightly above 0*C clump together easily...
Snowflakes that fall through really cold and dry air become powdery and don't stick together as easily.