The diagram below shows the general pattern of air circulation in the atmosphere.
Many of the world's deserts are located at latitudes slightly below 30° N. This includes the region marked with an X on the map. Which of the following statements best explains this?
A.
Most of the moisture is removed from the air before it rises into the upper atmosphere.
B.
The air descending from the upper atmosphere contains very little moisture.
C.
Moist air near the equator tends to flow away from land and toward the oceans.
D.
Air near the equator moves quickly as Earth rotates, so it cannot carry much moisture.