The area around campus was littered this morning with small, spongy, ball-shaped snow pellets that fell over night. They are indeed fully recyclable.
Most clouds are comprised of a mixture of ice crystals and supercooled cloud droplets. Supercooled means that the droplets are below freezing, but remain in the liquid phase. Graupel is a type of snow pellet that forms as an ice crystal falls and collects these supercooled cloud droplets, which freeze on contact. This leads to the formation of a ball or lump shaped snow pellet.
|Source: Parkerjh, Wikipedia Commons|