Freezing Rain - this is liquid precipitation that falls in the form of drops, but freezes upon impact with the ground, roads, sidewalks and other exposed surfaces. The surfaces become "glazed" with ice.
Freezing Drizzle - similar to freezing rain, but has a smaller drop diameter and is lighter in intensity. Like freezing rain, it causes "glaze" but the ice usually does not get as thick.
Sleet or Ice Pellets - this is precipitation that falls as a solid, in the form of ice. Usually clear, but can have a whitish tint.
Snow - this is precipitation that falls as a solid. It can take on numerous forms, ranging from very small branched ice crystals to snowflakes and snow pellets.