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Like air bubbles in boiling water, snow does not form out of nothing. There has to be a defect, a foreign substance. In the case of snow, its existence probably starts with a piece of dirt floating in air and drawn by rising air upward. Water moisture in air causes some water molecules to cling to the dirt particle. A small water droplet is forming. If the air temperature is below freezing (about zero degree Celsius at normal atmospheric pressure), the water droplet solidifies and a tiny ice molecule is formed. More water molecules are drawn to the cool icy surface and the slowly-building ice molecules become snow. A fast-forming ice particle will be called hail. A ice-forming failure results in something more like fog. Snow can form even when the tiny icy entity (with a dirt particle in the nucleus) is falling down to earth, if the temperature stays below freezing. Catch a snow flake on your palm and you can see the snow flake melts. However, within the blink of an eye, you can even see a tiny piece of ice in the middle of the puddle of water droplet on you palm.

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