Precipitation is water that falls from the sky. The tiny water droplets are big enough to form visible clouds but not yet big enough to fall. Precipitation happens when millions of cloud droplets collide together to form a single raindrop or through another process where ice crystals are rapidly formed into snow or hail.
Precipitation is not the only way water can move from the sky to the ground. Back when Frannie was investigating evaporation, she touched on the concept of sublimation, where solid forms of water can become vapor without ever entering the liquid phase.
Deposition, or desublimation, is the opposite of that. In sub-freezing air, water vapor can turn directly into ice. It’s very possible you’ve already seen this process in action. On very cold winter days, water vapor goes through process of deposition to become the frost, also known as hoarfrost, that you can see coating plant stems, spiderwebs, and wires.
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