【正确答案】正确答案： Snow Snow is a form of frozen water. / It contains many groups of tiny ice particles called snow crystals. / These crystals grow from water particles in cold clouds. / They usually grow around a piece of dust. / All snow crystals have six sides, but they grow in different shapes. / The shape depends mainly on the temperature and water levels in the air. / Snow crystals grow in one of two designs-platelike and columnar. / Platelike crystals form when the air temperature is about fifteen degrees below zero Celsius. / Columnar snow crystals look like sticks of ice. / They form when the temperature is about five degrees below zero Celsius. /