Why is air never completely dry?
A) Water vapor makes up as much as 4% of the atmosphere
B) Clouds and fog are actually liquid droplets of water
C) Water's very presence in the atmosphere accounts for dew, rain, and snow
D) All of these choices

Question

Quizplus · Accepted Answer

The relative abundance of water vapor ensures air never is completely dry. The water vapor in the atmosphere can condense into clouds, fog, or even rain and snow. The water vapor originates from the ground, plants, and the sea surface. Information can be found in the section The Atmosphere Is Composed Mainly of Nitrogen, Oxygen, and Water Vapor.

Why Is Air Never Completely Dry