When water freezes and freezes, it gradually fixes its shape. If it freezes in the natural environment, it will form mainly hexagonal ice crystals. There are many kinds of ice crystals, from the most typical snowflakes, columns, flat plates, needles... etc. Different atmospheric pressure and temperature will lead to different results. Ice crystals in the atmosphere are a very important part. Ice crystals can form many different cloud images and light images, and can also help us weather forecasts.