Author Question: Why is air never completely dry? a. Water vapor makes up as much as 4 of the atmosphere b. Clouds ... (Read 22 times)

kodithompson · **on:** Aug 22, 2018

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 2

What occurs at the boundaries of circulation cells?
a. Winds move eastward due to the Coriolis Effect
b. Winds moves towards the poles
c. Winds move horizontally and at high speeds
d. Winds move vertically where the boundaries meet

nyrave · **Reply #1 on:** Aug 22, 2018

Answer to Question 1

ANS: D
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.

Answer to Question 2

ANS: D
Winds move vertically at the boundaries of circulation cells. The surface winds become weak and
erratic. Information can be found in the section Atmospheric Circulation Generates Large-Scale
Surface Wind Patterns.