Rain and snow are two forms of .

Precipitation is any type of water that forms in the Earth's atmosphere and then drops onto the surface of the Earth.
The rain that falls from clouds but freezes before it reaches the ground is called sleet or ice pellets.
Snow is precipitation that falls in the form of ice crystals
Hail forms when very cold water droplets freeze, or turn solid, as soon as they touch things like dust or dirt
Water vapor in the atmosphere is visible as clouds and fog.

Ithink the answer is d.